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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z -


A Object code library
AA Audible audio file
AAM Authorware shocked file
AAS Authorware shocked packet
AB Applix Builder file
ABF Adobe Binary Screen Font
ABK Corel Draw AutoBackup
ABO Applix Builder Turbo file
ABS MPEG Audio Sound file
ABS Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) AutoBackup
ACA Project Manager Workbench file
ACB ACBM Graphic image
ACC DR-DOS Viewmax file
ACE ACE Archiver Compression file
ACL Corel Draw 6 keyboard accelerator file
ACM Windows system directory file
ACM Dynamic Link Library (DLL)
ACP Microsoft Office Assistant Preview file
ACR American College of Radiology file
ACT Microsoft Office Assistant Actor file
ACT FoxPro Foxdoc Action Diagram
ACT Action Presentation
ACV Used to Compress and decompress audio data
AD After Dark screensaver
ADA Ada source text file (non-GNAT)
ADB Ada source text body file (GNAT)
ADB HP 100LX Organizer Appointment database
ADC Scanstudio 16 color Bitmap Graphic file
ADD OS/2 adapter driver file used in the boot process
ADF Amiga disk file
ADI AutoCAD device-independent binary plotter file
ADL QEMM Mca adaptor description library
ADM After Dark MultiModule screensaver
ADM Windows NT policy template
ADN Lotus 1-2-3 Add-In file
ADP FaxWorks Faxmodem setup file
ADP Astound Dynamite file
ADR After Dark Randomizer screensaver
ADR Smart Address address book
ADS Ada source text specification file (GNAT)
ADT HP NewWave datafile for card applications
ADT AdTech Fax file
ADX Dynazip Active Delivery script
ADX Lotus Approach dBase Index
ADX Archetype Designer Document
AF2 ABC FlowCharter 2.0 Flowchart
AF3 ABC Flowchart
AFC Apple Sound file
AFI Truevision Bitmap graphic
AFM Adobe font metrics
AFM HP NewWave Cardfile application
AG Applix graphic
AI Adobe Illustrator drawing
AI Corel Trace drawing
AIF Audio Interchange File, a sound format used by Silicon Graphics and Macintosh applications
AIFC Similar to AIF (compressed)
AIFF Similar to AIF
AIM AOL Instant Messenger Launch file
AIN AIN Compressed archive
AIO APL transfer file
AIS ACDSee Image Sequence
AIS Velvet Studio Instruments file
AIS Xerox Arry of Intensity Samples Graphic
AIX HP NewWave Cardfile Application data
AKW Contains all A-keywords in the RoboHELP Help Project Index Designer not associated with topics
ALAW European Telephony audio
ALIAS Alias Image
ALB JASC Image Commander album
ALL Arts & Letters Library
ALL WordPerfect for Windows General printer information file
ALS Alias Image
ALT WordPerfect Library Menu
AM Applix SHELF Macro
AMF Music file (Advanced Module Format)
AMG AMGC Compressed archive
AMG ACTOR System image
AMS Velvet Studio music module (MOD) file
AMS Extreme's Tracker module
ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
ANI Microsoft Windows Animated cursor
ANM DeluxPaint Animation
ANN Windows 3.x Help annotation
ANS ANSI text file
ANT SimAnt for Windows saved game
AOS Nokia 9000 Add-on software
AP Applix Presents file
AP WHAP Compressed Amiga archive
APC Lotus 1-2-3 Printer driver
APD Lotus 1-2-3 Printer driver
APF Lotus 1-2-3 Printer driver
API Application Program Interface; used by Adobe Acrobat
API Lotus 1-2-3 Printer driver
APL APL Workspace file
APP Symphony Add-in Application
APP dBase Application Generator Object
APP DR-DOS Executable Application
APP FoxPro Generated Application
APR Employee Appraiser Performance Review file
APR Lotus Approach 97 View file
APS Microsoft Visual C++ file
APT Lotus Approach Data view file
APX Lotus Approach Paradox-Specific information file
APX Borland C++ Appexpert database
AQ Applix data
ARC LH ARC (old version) compressed archive
ARC SQUASH Compressed archive
ARF Automatic Response file
ARI ARI Compressed archive
ARI Aristotle audio file
ARJ Robert Jung ARJ compressed archive (ARJ)
ARK ARC File Archiver CPM/Port archive
ARL AOL v4.0 organizer file
ARR Atari Cubase Arrangement
ART Xara Studio drawing
ART Canon Crayola art
ART Clip Art
ART Ray Tracer file
ART First Publisher Raster graphic
ART AOL Image file compressed using the Johson-Grace compression algorithm
ARX ARX Compressed Archive
AS Applix Spreadsheet
ASA Microsoft Visual InterDev file
ASC ASCII text file
ASC PGP armored encrypted file
ASD WinWord AutoSave file
ASD Lotus 1-2-3 Screen driver
ASD Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX
ASD Astound Presentation
ASE Velvet Studio Sample file
ASF Microsoft Advanced Streaming Format
ASF StratGraphics Datafile
ASF Lotus 1-2-3 Screen font
ASH TASM 3.0 Assembly language header
ASI Borland C++/Turbo C Assembler Include file
ASM Assembler Language source file
ASM Pro/E assembly file
ASO Astound Dynamite Object
ASP Active Server Page (an HTML file containing a Microsoft server-processed script)
ASP Procomm Plus setup and connection script
ASP Astound Presentation
AST Astound multimedia file
AST Claris Works "assistant" file
ASV DataCAD Autosave file
ASX Cheyenne Backup script
ASX Microsoft Advanced Streaming Redirector file
ASX Video file
AT2 Aldus Persuasion 2.0 Auto Template
ATM Adobe Type Manager data/info file
ATT AT&T Group 4 bitmap
ATW AnyTime Deluxe for Windows personal information manager file from Individual Software MultiModule screensaver
AU Sun/NeXT/DEC/UNIX sound file
AU Audio U-law 
AUX TeX/LaTeX Auxilliary Reference file
AUX ChiWriter Auxilliary Dictionary file
AVA Avagio Publication
AVB Inculan Anti-Virus virus infected file
AVI Microsoft Audio Video Interleaved file for Windows movie
AVR Audio Visual Research file
AVS Application Visualization System file
AVS Stardent AVS-X Image
AW HP AdvanceWrite Text file
AW Applix Words file
AWD FaxView Document imagine
AWK AWK Script/Program
AWM Animation Works Movie
AWR Telsis file for digitally stored audio
AWS StatGraphics Data file
AXX ARJ compressed file from a multi-volume archive (xx = a number from 01 to 99)
A3L Authorware 3.x library
A4L Authorware 4.x library
A5L Authorware 5.x library
A3M Authorware MacIntosh file (unpackaged)
A4M Authorware MacIntosh file (unpackaged)
A4P Authorware file (packaged without runtime)
A3W Authorware Windows file (unpackaged)
A4W Authorware Windows file (unpackaged)
A5W Authorware Windows file (unpackaged)


B Applause Batch list
BAD Oracle bad file
BAK Backup file
BAL Ballade Music score
BAR dBase Application Generator Horizontal menu object
BAS BASIC source code
BAT Batch file
BB Papyrus Database backup
BBL TeX/BibTeX Bibliographic reference file
BBM Deluxe Paint Bitmap image
BBS Bulletin Board Sytem text
BCH Batch Process Object (dBase Application Generator)
BCH Datalex Entry Point 90 Data file
BCM Microsoft Works Communications file
BCO Bitstream Outline font description file
BCP Borland C++ Makefile
BCW Borland C++ 4.5 Environment settings file
BDB Microsoft Works Dababase file
BDF West Point Bridge Designer file
BDF Egret Datafile
BDR Microsoft Publisher Border
BEZ Bitstream Outline font description
BF2 Bradford 2 Font
BFC Windows 95 Briefcase Document
BFM Font Metrics file (Unix/Mainframe)
BFX BitFax graphic
BG Microsoft Backgammon Game file
BGA OS/2 Graphic array
BGI Borland Graphics Interface Driver
BGL Microsoft Flight Simulator Scenery file
BHF pcAnywhere Host file
BI Binary file
BIB Bibliography file (ASCII)
BIB TeX/BibTeX Literature Database
BIB Database
BIF GroupWise initialization file
BIF Image Capture Board Binary Image black & white graphic
BIN Binary file
BIO OS/2 Bios file
BIT X11 Bitmap
BK Backup file (Generic)
BK JetFax Faxbook file
BK$ Backup file (Generic)
BK! WordPerfect for Windows Document backup
BK1 WordPerfect for Windows Timed backup file for document window 1
BK2 WordPerfect for Windows Timed backup file for document window 2
BK3 WordPerfect for Windows Timed backup file for document window 3
BK4 WordPerfect for Windows Timed backup file for document window 4
BK5 WordPerfect for Windows Timed backup file for document window 5
BK6 WordPerfect for Windows Timed backup file for document window 6
BK7 WordPerfect for Windows Timed backup file for document window 7
BK8 WordPerfect for Windows Timed backup file for document window 8
BK9 WordPerfect for Windows Timed backup file for document window 9
BKP TurboVidion Dialog Designer Backup
BKS IBM BookManager Read bookshelf file
BKS Microsoft Works Spreadsheet Backup
BKW FontEdit Fontset mirror image
BLD BASIC Bloadable picture file
BLK Alias Wavefront Image
BLK WordPerfect for Windows Temporary file
BM Windows system Bitmap
BMF Corel Gallery file
BMK Windows Help bookmark
BMP Windows or OS/2 bitmap
BM1 Apogee BioMenace data
BNK AdLib Instrument Bank file
BOO Microsoft Booasm.arc Compressed archive
BOOK Adobe FrameMaker Book
BOX Lotus Notes file
BPC Business Plan Toolkit Chart
BPL Borland Delphi 4 packed library
BPS Microsoft Works Document
BPT CorelDraw Bitmap fills file
BPX Truevision Targa Bitmap
BQY BrioQuery file
BR Bridge Script
BRD Eagle Layout file
BRK Brooktrout Fax-Mail file
BRX A file for browsing an index of multimedia options (pictures, sound, text, videos) on a CD-ROM
BRZ DbBRZ file for very large Db backup or restore
BSA BSARC Compressed archive
BSC Apple II Compressed archive
BSC Fortran Pwbrmake Object
BSC MS Developer Studio (MSDev) browser information
BSP Quake map file
BS1 Apogee Blake Stone data file
BS Microsoft Bookshelf Find Menu shell extension
BTM Batch file used by Norton Utilities
BUD Backup disk for Quicken
BUG Bugs and Problems file
BUN CakeWalk Audio Bundle (a MIDI program)
BUP Backup
BUT Buttons! Button definition
BUY Movie data file
BV1 WordPerfect for Windows Overflow file below insert point in document 1
BV2 WordPerfect for Windows Overflow file below insert point in document 2
BV3 WordPerfect for Windows Overflow file below insert point in document 3
BV4 WordPerfect for Windows Overflow file below insert point in document 4
BV5 WordPerfect for Windows Overflow file below insert point in document 5
BV6 WordPerfect for Windows Overflow file below insert point in document 6
BV7 Wordperfect for Windows Overflow file below insert point in document 7
BV8 WordPerfect for Windows Overflow file below insert point in document 8
BV9 WordPerfect for Windows Overflow file below insert point in document 9
BW SGI Black and White image file
BW Silicon Graphics Raw red,green and blue bytes file
BWB Visual Baler Spreadsheet application
BWR Kermit Beware buglist
BWV Business Wave file
B1N 1st Reader Mono and color binary screen image
B30 ABC Ventura publisher printer font
B4 Helix Nuts and Bolts file
B8 Raw graphic file (Piclab Plane II)
B_W Atari/Macintosh black and white graphic
B&W Atari/Macintosh black and white graphic
B&W 1st Reader Mono binary screen image


C C code
CA Telnet Server Initial cache data file
CAB Microsoft cabinet file (program files compressed for software distribution)
CAC dBase IV Executable file
CAD Softdesk Drafix Cad file
CAL CALS Compressed Bitmap
CAL SuperCalc 4/5 Spreadsheet
CAL Calendar schedule data file
CAM Casio camera file
CAN Navigator Fax
CAP Ventura Publisher Caption
CAP Compressed music file
CAP Telix Session Capture file
CAS Comma-delimited ASCII file
CAT Quicken IntelliCharge categorization file
CAT dBase Catalogue file
CB Microsoft clean boot file
CBC CubiCalc Fuzzy Logic System file
CBI Column binary file (used in IBM mainframe systems)
CBL Cobol Source code
CBM XLib Compiled Bitmap
CBT Generic Computer based training file
CC Visual dBASE custom class file
CC C++ Source code
CCA cc:mail file
CCB Visual Basic Animated Button configuration file
CCC Curtain Call Native bitmap graphic
CCF Multimedia Viewer configuration file used in OS/2
CCF Symphony Communications Configuration file
CCH Corel Chart
CCL Intalk Communication Command Language
CCM Lotus CC:Mail "box" file (for example, INBOX.CCM)
CCO CyberChat data file
CCO XBTX Graphics
CCT Macromedia Director Shockwave cast file
CDA CD Audio Track
CDB Clipboard file
CDB CardScan Database
CDB TCU Turbo C Utilities Main database
CDF Netcdf Graphic file
CDF Microsoft Channel Definition Format
CDI Phillips Compact Disk Interactive file
CDK Atari Calamus Document
CDM Visual dBASE custom data module
CDR Corel Draw Vector drawing file
CDR Raw Audio-CD data file
CDT Corel Draw template
CDT CorelDraw Data file
CDX Corel Draw compressed drawing
CDX Microsoft's Visual FoxPro index
CE The FarSide Computer Calendar Main CE file
CEG Tempra Show Bitmap graphic
CEL CIMFast Event Language file
CEL AutoDesk Animator Cel Image
CER Certificate file (MIME x-x509-ca-cert)
CF Imake Configurtion file
CFB Comptons Multimedia file
CFG Configuration file
CFL CorelFLOW Chart
CFM ColdFusion template
CFM Visual dBASE Windows customer form
CFM Corel FontMaster file
CFN Atari Calamus Font data file
CFO TCU Turbo C Utilities C form object
CFP The Complete Fax Portable fax file
CGA Ventura Publisher Display font file
CGI Common gateway interface script
CGM Computer Graphic Metafile
CH OS/2 configuration file
CH Clipper 5 Header
CH3 Harvard Graphics 3.0 Chart
CH4 Charisma 4.0 Presentation
CHD FontChameleon Font descriptor
CHF pcAnywhere remote control file
CHI ChiWriter Document
CHK File fragments saved by Windows Disk Defragmenter or ScanDisk
CHK WordPerfect for Windows Temporary file
CHL Configuration History Log
CHM Compiled HTML file
CHN Ethnograph Data file
CHP Ventura Publisher Chapter file
CHR Character Sets (Font file)
CHT ChartViewer file
CHT Harvard Graphics vector file
CHT ChartMaster dBase Interface file
CIF CalTech Intermediate Graphic
CIF Easy CD Creator image
CIF pcAnywhere caller file
CIL Clip Gallery download package file
CIM Sim City 2000 file
CIN OS/2 change control file that tracks changes to an INI file
CIX TCU Turbo C Utilities Database Index
CKB Borland C++ Keyboard mapping file
CK1 iD/Apogee Commander Keen 1 data
CK2 iD/Apogee Commander Keen 2 data
CK3 iD/Apogee Commander Keen 3 data
CK4 iD/Apogee Commander Keen 4 data
CK5 iD/Apogee Commander Keen 5 data
CK6 iD/Apogee Commander Keen 6 data
CL Generic LISP Source code
CLASS Java class
CLG Disk Catalog database
CLL Cricket Software Clicker File
CLO Cloe Image
CLP Windows Clipboard
CLP Quattro Pro Clip art
CLP Clipper 5 Compiler Script
CLR 1st Reader Binary color screen image
CLR PhotStyler Color defintion
CLS Visual Basic Class Module
CLS C++ Class Definition
CM Craftman Data
CMD Command file for Windows NT (similar to a DOS .BAT file), OS/2
CMD DOS CP/M command file
CMD dBase-II program file
CMD 1st Reader External Command Menu
CMF Corel Metafile
CFM Creative FM-Music
CMG Chessmaster saved game
CMK Card Shop Plus file
CMM CEnvi Batch file
CMP Address document
CMP CorelDRAW 4.0 Postscript Printer Header
CMP Route 66 Address Document
CMP Microsoft Word for DOS User dictionary
CMR MediaPlayer Movie
CMV Corel Move animation
CMX Corel Presentation Exchange image
CMYK Raw cyan, magenta, yellow, and black bytes file
CNC CNC General Program data
CNF Configuration file used by Telnet, Windows, and other applications with varying internal formats
CNM Windows application menu options and setup file
CNQ Compuworks Design Shop file
CNT Windows (or other) system content files for the help index and other purposes
CNV Word for Windows Data conversion support file
CNV WordPerfect for Windows Temporary file
COB trueSpace 2 object
COB COBOL Source code
COD Microsoft C compiler output as displayable machine language/assembler with original C as comments
COD FORTRAN Compiled code
COD dBase Application Generator Template source file
COD Video Text file
COL AutoDesk Animator Color Palette
COL Microsoft Multiplan Spreadsheet
COM Command file (program)
CON Simdir Configuration file
CP8 CP8 256 Gray Scale image
CPD Corel PrintOffice file (drawing)
CPD Fax Cover document
CPD Complaints Desk Script
CPE Fax Cover document
CPF The Complete Fax (Fax file)
CPI Microsoft MS-DOS code page information
CPI ColorLab Processed Image bitmap
CPJ CeQuadrant CD Project
CPL Control Panel Module
CPL Compel Presentation
CPL Corel color palette
CPO Corel Print House file
CPP C++ Source code
CPP CA-Cricket Presents presentation
CPR Corel Presents presentation
CPS Central Point PC Tools Backup
CPS Coloured postscript
CPT Corel Photo-Paint image
CPT Macintosh Compressed Archive
CPT dBase Encrypted Memo
CPT CA-Cricket Presents Template
CPX Corel Presentation Exchange compressed drawing
CRD Microsoft Windows 3.x Cardfile
CRF Zortech C++ cross-reference
CRP Corel Presents run-time presentation
CRP Visual dBASE custom report
CRP dBase IV Encrypted database
CRS WordPerfect 5.1 for Windows File Conversion resource
CRT Certificate file
CRT Oracle Terminal settings information
CRU CRUSH Compressed archive
CSA Comma deliminated text
CSC Corel script
CSG Statistica/w Graph file
CSM Borland C++ 4.5 Precompiled header
CSP PC Emcee On-Screen image
CSS Stats+ Datafile
CSS Statistica/w Datasheet
CSS Cascading Style Sheet (MIME)
CST Macromedia Director "Cast" (resource) file
CSV Comma-separated values file
CSV CompuShow Adjusted EGA/VGA Palette
CT Scitex CT bitmap
CT A graphic file associated with the Paint Shop Pro Graphic Editor
CTC PC Installer Control
CTF Symphony Character code translation
CTL Used in general for files containing control information. FAXWorks uses it to keep information about each fax sent and received.
CTL dBase IV Control
CTX Visual Basic User control binary file
CTX Pretty Good Privacy (PGP) Ciphertext file
CTX Microsoft Online Course Text
CUE Microsoft Cue Cards data
CUR Windows Cursor
CURSOR Sun Microsystems Cursor
CUT Dr Halo Bitmap
CV Corel Versions archive
CV Microsoft CodeView information screen
CVG Image
CVS Canvas drawing file
CWK Claris Works data
CWS Claris Works template
CXT Macromedia Director protected (not editable) "Cast" (resource) file
CXX C++ source code
C-- Sphinx C-- Source code
C00 Ventura Publisher Print file
C01 Typhoon wave
C86 Computer Innovation (C86) Source code


DAO Windows Registry Backup
DAT Data file
DAT WordPerfect Merge Data
DAT Extension used for some MPEG files
DB Borderland's Paradox 7 table database
DBC Microsoft's Visual FoxPro database container file
DBF A dBASE file, a format originated by Ashton-Tate, but understood by Act!, Clipper,FoxPro, Arago, Wordtech, xBase, and similar database or database-related products.
DBF Enable database (can be opened with Excel 97)
DBF Oracle 8.1.x tablespace file
DBK dBase Database Backup
DBQ Paradox Memo
DBT dBase Text Memo
DBX DataBeam image
DBX Microsoft's Visual Foxpro Table file
DCA Visual Basic Active designer cache
DCIM Digital Imaging and Communications in Medicine (image and data)
DCM DCM module
DCR Shockwave file
DCS Desktop Color Separation file
DCT Microsoft's Visual FoxPro database container file
DCU Delphi compiled unit
DCX Microsoft's Visual FoxPro database container file
DCX Fax image (based on PCX)
DCX Macro file
DC5 DataCAD Drawing
DDF Btrieve or Xtrieve Data Definition File, which contains metadata describing a Btrieve or Xtrieve file
DDIF Digital Equipment or Compaq file. Used for storing images and their word processing documents
DEF SmartWare II data
DEF C++ definition file
DEFI Oracle 7 de-install script
DEM A file with USGS standards for Digital Elevation Models
DEP Visual Basic Setup Wizard Dependency file
DER Certificate file
DEWF Macintosh SoundCap/SoundEdit recorded instrument file
DGN Microstation95 CAD drawing
DIB Device-independent bitmap
DIC Dictionary file
DIF Data Interchange Format spreadsheet
DIG Digilink file
DIG Sound Designer I audio
DIR Macromedia Director file
DIS Ray Tracer file
DIZ Description file
DL Image
DLG C++ Dialogue Script
DLL Dynamic-link library file
DLS Downloadable sound
DMD Visual dBASE data module
DMF X-Trakker music module (MOD)
DOB Visual Basic User document
DOC FrameMaker or FrameBuilder document
DOC WordStar document
DOC WordPerfect document
DOC Microsoft Word document
DOC DisplayWrite document
DOT Microsoft Word document template
DOX Visual Basic User document binary form
DPL Borland Delphi 3 packed library
DPR Borland Delphi project header
DRAW Acorn's object-based vector image
DRV Driver
DRW Micrografx Designer/Draw
DRW Lotus Freelance Image
DRW Pro/E drawing
DS4 Micrografx Designer Image
DR9 Directory file
DSF Micrografx Designer v7.x file
DSG DooM saved game
DSM Dynamic Studio music module (MOD)
DSN ODBC Data source
DSP Microsoft Developer Studio project
DSR Visual Basic Active designer file
DST Embroidery machines graphic file
DSW Microsoft Developer Studio workspace file
DSX Visual Basic Active designer binary file
DTA World Bank's STARS data
DTD SGML Document Type Definition (DTD) file
DTED Digital terrain elevation data (geographic data format)
DTM DigiTrakker module
DTF Symantec Q&A relational database
DUN Microsoft Dial-up Networking Export file
DUP Duplicate Backup
DV Digital video (MIME)
DVI TeX binary file
DWD DiamondWare digitized file
DWF Vector graphic (Autodesk)
DWG Autocad Drawing
DWG AutoCAD drawing, or older Generic CADD drawing file
DX Digital Electric Corporation (DEC) Data exchange file
DXF Drawing Interchange (eXchange) format,a text representation of the binary DWG format
DXF Data Exchange File
DXR Macromedia Director protected (not editable) movie file
D64 Commodore 64 emulator disk image


ED6 EDMICS image
EDA Ensoniq ASR disk image
EDB ROOTS3 Geneological data
EDE Ensoniq EPS disk image
EDD Element Definition document (FrameMaker+SGML documents)
EDK Ensoniq KT disk image
EDQ Ensoniq SQ1/SQ2/KS32 disk image
EDS Ensoniq SQ80 disk image
EDV Ensoniq VFX-SD disk image
EFA Ensoniq ASR file
EFE Ensoniq EPS file
EFK Ensoniq KT file
EFQ Ensoniq SQ1/SQ2/KS32 file
EFS Ensoniq SQ80 file
EFV Ensoniq VFX-SD file
EL eMac Lisp Source code
ELC eMac Lisp Source code (byte-compiled)
EMD ABT Extended MoDule
EMF Enhanced Windows Metafile
EML Microsoft Outlook Express mail message
ENC Encore file
ENC Video file
ENFF Neutral Format
EPHTML Enhanced Perl-parsed HTML
EPS2 Adobe Level II Encapsulated Postscript
EPS Encapsulated PostScript image file
EPSF Encapsulated PostScript
EPSI Adobe Encapsulated Postscript Interchange
ER1 ERWin file
ERR Stores the error messages that result when the RoboHELP Help Compiler attempts to compile the source files of a Help system
ERX ERWin file
EUI Ensoniq ESP family compacted disk image
EVY Envoy document
EWL Microsoft Encarta document
EXC Microsoft Word Exclusion Dictionary file
EXE Executable file (program)


F Compressed file archive (FREEZE)
FAC Face graphic
FAQ Frequently Asked Questions document
FAR Music module (MOD) (Farandole Composer)
FAV Navigation bar (Microsoft Outlook)
FAX FAX Type image
FBK Backup (Navison Financials)
FC Spell Check dictionary file (Harvard Graphics)
FCD Virtual CD-ROM file
FCM Binary file patch (Forward Compression)
FD Declaration file (FORTRAN)
FD Field offsets for compiler (DataFlex)
FDB Database (Navison Financials)
FDF Forms Document (Adobe Acrobat)
FDW Document form (F3 Design and Mapping)
FEB Button Bar for Figure Editor (Microsoft WordPerfect for Windows)
FEM CADRE Finite Element Mesh
FF Outline Font description (AGFA CompuGraphics)
FFA MS find fast file
FFF Fax document (defFax)
FFF GUS PnP bank file
FFL MS fast find file
FFO MS fast find file
FFT Final Form Text (part of IBM's DCA)
FFX MS fast find file
FH3 Aldus Freehand 3 drawing (Vector graphic)
FH4 Aldus Freehand 4 drawing (Vector graphic)
FI File Interface (FORTRAN)
FIF Fractal Image
FIL File template (Application Generator)
FIL File List Object (dBase Application Generator)
FIL Overlay (Microsoft WordPerfect for Windows)
FIN Print formatted text (Perfect Writer)
FIT Graphic (FITS)
FIT File index table (Microsoft Windows NT)
FITS CCD camera image
FITS Flexible Image Transport System file
FIX Patch file (Generic)
FKY Macro (Microsoft FoxPro)
FLA Movie (Macromedia Flash)
FLB Format library (Papyrus)
FLC FLIC animation (AutoDesk)
FLD File folder (Charisma)
FLF Delived form (Corel Paradox)
FLF License (Navison Financials)
FLI FLIC animation (AutoDesk)
FLI Font library (EmTeX)
FLF Driver (OS/2)
FLM Film Roll (AutoCAD)
FLO FlowCharter file (MicroGrafx)
FLT Filter (Corel)
FLT Filter (Micrografx Picture Publisher)
FLT Graphics filter support file (Asymetrix ToolBook)
FLT Music module (MOD) (StarTrekker)
FLT Open Flight file (MulitGen)
FLX Compiled binary file (DataFlex)
FM Spreadsheet (FileMaker Pro)
FM FrameMaker Document (Adobe)
FM1 Spreadsheet (Lotus 1-2-3, version 2.x)
FM3 Device driver (Harvard Graphics, version 3.0)
FM3 Spreadsheet (Lotus 1-2-3, version 3.x)
FMB Binary source code for form, (Oracle, v4.x and later)
FMB File Manager button bar (Microsoft WordPerfect for Windows)
FMF Font or Icon (IBM LinkWay)
FMK MakeFile (FORTRAN PowerStation)
FML Mirror list (Oracle)
FMO Compiled format (dBase IV)
FMT Text format for form file (Oracle, v4.x and later)
FMT Print file (Microsoft Schedule+)
FMT Style sheet (Sprint)
FMX Executable form, (Oracle,v4.x and later)
FN3 Font (Harvard Graphics)
FND Saved Search (Find applet) (Microsoft Explorer)
FNG Font group (Font Navigator)
FNK Module (FunkTracker)
FNT Font (Generic)
FNX Inactive font (Exact)
FO1 Font (Borland Turbo C)
FO2 Font (Borland Turbo C)
FOG Fontographer font
FOL Saved message folder (1st Reader)
FON Font (Generic)
FON Call log (Procomm Plus)
FON System font (Generic)
FON Dialing directory (Telix)
FOR FORTRAN source code
FOR Form (WindowBase)
FOT Font-related file (Generic)
FOT Installed TrueType font (Microsoft Windows Font Installer)
FP Configuration file (FoxPro)
FP FileMaker Pro file
FP1 "Flying Pigs" screensaver datafile (Microsoft Windows 9.x)
FP3 FileMaker Pro file
FPC Catalog file (FoxPro)
FPT FileMaker Pro file
FPT Memo fields (Microsoft FoxPro)
FPW Floorplan drawing (FloorPlan Plus for Windows)
FPX Bitmap (FlashPix)
FR3 Renamed dBaseIII+ form (dBase IV)
FRF Font (FontMonger)
FRG Uncompiled report (dBase IV)
FRM Form (Generic)
FRM Document (FrameMaker or FrameBuilder)
FRM Executable file (Oracle,v3.0 and earlier)
FRM Form (Visual Basic)
FRM Merge form (Microsoft WordPerfect for Windows)
FRM Symbol Report (DataCAD)
FRO Compiled report (dBase IV)
FRP Form (PerForm PRO Plus)
FRS Screen Font Resource (Microsoft Wordperfect for Windows)
FRT Report menu (FoxPro)
FRX Form stash file (Visual Basic)
FRX Report (Microsoft FoxPro)
FSF fPrint Audit Tool
FSL Paradox 7 form (Borderland)
FSL Form (Paradox for Windows)
FSL Saved form (Corel Paradox)
FSM Sample file (Farandoyle)
FST Linkable program (dBFast)
FSX Data (Lotus 1-2-3)
FT Full text index (Lotus Notes)
FTG Help system full-text search group file (Microsoft Windows)
FTM Font (MicroGrafx)
FTP File transfer protocol (Internet Generic)
FTS Help system full-text search index (Windows)
FW Database (Framework II)
FW2 Database (Framework II)
FW3 Database (Framework III)
FW4 Database (Framework IV)
FX On-Line guide (FastLynx)
FXD Phonebook (FAXit)
FXP Compiled source code (FoxPro)
FXS Fax Transmit graphic (WinFax)
FZB Bank dump file (Casio FZ-1)
FZF Full dump file (Casio FZ-1)
FZV Voice dump file (Casio FZ-1)
F01 Fax document (Perfect Fax)
F06 Dos screen text font (height= 6 pixels)
F07 Dos screen text font (height= 7 pixels)
F08 Dos screen text font (height= 8 pixels)
F09 Dos screen text font (height= 9 pixels)
F10 Dos screen text font (height= 10 pixels)
F11 Dos screen text font (height= 11 pixels)
F12 Dos screen text font (height= 12 pixels)
F13 Dos screen text font (height= 13 pixels)
F14 Dos screen text font (height= 14 pixels)
F15 Dos screen text font (height= 15 pixels)
F16 Dos screen text font (height= 16 pixels)
F2R Linear music module (Farandole)
F3R Blocked music module (Farandole)
F77 Source code file (FORTRAN 77)
F90 FORTRAN file
F96 Fax document (Frecom FAX96)


G Data chart (APPLAUSE)
GAL Album (Corel Multimedia Manager)
GAM Fax document (GammaFax)
GBL Global definitions (VAXTPU Editor)
GC1 Lisp source code (Golden Common Lisp 1.1)
GC3 Lisp source code (Golden Common Lisp 1.1)
GCD Generic (TM) CADD drawing (later versions)
GCP Image processing file (Ground Control Point)
GDB Database file (InterBase)
GDF Dictionary file (GEOS)
GDM Bells, whistles, and sound boards module
GED Genealogical data (GEDCOM)
GED Graphic Environment Document (drawing)
GED Graphics editor native format (Arts & Letters)
GED Graphics editor file (EnerGraphics)
GEM Metafile (GEM)
GEM Vector graphics (Ventura Publisher)
GEN Generated text (Ventura Publisher)
GEN Compiled template (dBase Application Generator)
GEO Geode (Geoworks)
GetRight Unfinished-Download (GetRight)
GFB Compressed gif image (GIFBLAST)
GFC Patton&Patton Flowcharting 4 flowchart
GFI Graphics Link presentation (Genigraphics)
GFT Font (NeoPaint)
GFX Genigraphics Graphics Link presentation
GIB Chart (Graph-in-the-Box)
GID Windows 95 global index (containing help status)
GIF Bitmap (CompuServe)
GIM Graphics Link presentation (Genigraphics)
GIW Presentation (Graph-in-the-Box for Windows)
GIX Graphics Link presentation (Genigraphics)
GKH Ensoniq EPS family disk image
GKS GripKey document (Gravis)
GL Animation file (GRASP GRAphical System for Presentation)
GLM Datafile (Glim)
GLS Datafile (Across)
GLY Glossary (Microsoft Word)
GMP Tile map (Geomorph) (SPX)
GNA Graphics Link presentation (Genigraphics)
GNT Generated executable code (Micro Focus)
GNX Graphics Link presentation (Genigraphics)
GOC Goc sorce code (Geoworks)
GOH Goc header (Geoworks)
GP Geode parameter file (Geoworks Glue)
GPH Graph (Lotus 1-2-3/G)
GPK Program package (Omnigo)
GR2 Screen driver (Microsoft Windows 3.x)
GRA Graph (Microsoft)
GRA Datafile (SigmaPlot)
GRB Shell Monitor (MS-DOS v5.0)
GRD Image processing grid (CHIPS)
GRF Grapher (Golden Software) graph
GRF Graph (Charisma Graph Plus)
GRP Program Manager Group (Microsoft)
GRP Pictures group (PixBase)
GRY Raw graphic (GREY)
GS1 Presentation (GraphShow)
GSD Vector graphic (Professional Draw)
GSM Audio stream Raw GSM (6.10 audio stream)
GSM Audio stream Raw 'byte aligned (GSM 6.10 audio stream)
GSM GSM w.o. header/VoiceGuide/RapidComm file (US Robotics voice modems)
GSM GSM w. header/QuickLink file (US Robotics voice modems)
GSW Worksheet (GraphShow)
GTK Music module (Graoumftracker) (old) (MOD)
GT2 Music module (Graoumftracker) (new) (MOD)
GUP Data (PopMail)
GWX Graphics Link presentation (Genigraphics)
GWZ Graphics Link presentation (Genigraphics)
GXL Graphics library (Genus)
GZ Compressed file (Unix gzip)
G721 Raw CCITT G.721 $bit ADPCM data
G723 Raw CCITT G.723 3 or 5bit ADPCM data
G8 Raw Graphics (one byte per pixel) Plane III (PicLab)


H Program header (C)
HA Compressed archive (HA)
HAP Compressed archive (HA)
HBK Handbook (MathCad)
HCM Configuration file (IBM HCM)
HCOM Sound Tools file (HCOM)
HCR Production configuration file (IBM HCD/HCM)
HDF National Center for Supercomputing Applications (NCSA) Geospatial Hierarchical Data
HDF Help file (Help development kit)
HDL Alternate download listing (ProComm Plus)
HDR Database header (Pc-File+)
HDR Datafile (Egret)
HDR Message header text (ProComm Plus)
HDR Message header text (1st Reader)
HDW Vector graphics (Harvard Draw)
HDX Help index (AutoCAD)
HDX Help index (Zortech C++)
HED Document (HighEdit)
HEL Hellbender saved game (Microsoft)
HEX Macintosh BinHex 2.0 file
HFI HP font info (GEM)
HGL Drawing file (HP Graphics Language)
HH Help system map (Generic)
HH Header file (C++)
HHH Precompiled header (Power C)
HHP Help information for remote users (ProComm Plus)
HLB Help library (VAX)
HLP Help file (Generic)
HLP Windows Help file (DataCAD)
HMM Alternate mail read option menu (ProComm Plus)
HNC Program files (CNC)
HOG Lucas Arts Dark Forces WAD file
HP8 Ascii text Roman8 character set (NewWave Write)
HPF HP LaserJet font (Adobe Pagemaker)
HPG HPGL Plotter vector graphics (AutoCAD)
HPG HPGL Plotter vector graphics (Harvard Graphics)
HPI Font information (GEM)
HPJ Help Project file (Visual Basic)
HPK Compressed archive (HPACK)
HPM Emm text (HP NewWave)
HPM Alternative menu for privileged users (ProComm Plus)
HPP Program header (C++)
HPP Header file (Zortech C++)
HQX BinHex (Macintosh 4.0)
HRF Rastor graphic (Hitachi)
HRM Alternate menu for limited users (ProComm Plus)
HS2 Monochrome image (Postering)
HSI Graphic (Handmade Software, Inc.)
HST History file (Generic)
HST History file (ProComm Plus)
HT HyperTerminal file
HTM A Web page (a file containing Hypertext Markup Language - HTML - markup)
HTML A Web page (a file containing Hypertext Markup Language - HTML - markup)
HTT Hypertext template (Microsoft)
HTX Template (Extended HTML)
HWD Presentation (Hollywood)
HXM HAM extension (Descent2)
HXM Alternate protocal selection menu (ProComm Plus)
HXX Header file (C++)
HY1 Hyphenation algorythm (Ventura Publisher)
HY2 Hyphenation algorythm (Ventura Publisher)
HYC Datafile (Microsoft WordPerfect for Windows)
HYD Hyphenation dictionary (Microsoft WordPerfect for Windows)
HYP Compressed archive (HYPER)
H! On-line Help (Flambeaux Help!)
H++ Header file (C++)
H-- Header file (Sphinx C--)


I Intermediate file (Borland C++)
IAX Bitmap (IBM Image Acess eXecutive)
IBM Compressed archive (ARCHDOS, IBM Internal only)
ICA Citrix file
ICA Bitmap graphic (Image Object Content Architecture)
ICB Targa bitmap
ICC Printer file (Kodak)
ICL Icon Library (Generic industry standard)
ICM Image Color Matching profile
ICN Icon source code
ICO Icon (Microsoft Windows 3.x)
ID Disk identification file (Generic)
IDB Intermediate file (Microsoft Developer)
IDD MIDI Instrument Definition
IDE Project file (Borland C++ v4.5)
IDF MIDI Instrument Definition (Windows 95 required file)
IDQ Data Query (Internet)
IDW Vector graphic (IntelliDraw)
IDX Relational database index (Microsoft FoxPro)
IDX Relational database index (Symantec Q&A)
IDX Microsoft Outlook Express file
IFD Form (JetForm Design)
IFF Interchange file, (Amiga ILBM)
IFF Image (Sun TAAC/SDSC Image Tool)
IFP Script (KnowledgeMan)
IFS Compressed fractal image (Yuvpak)
IFS System file (OS/2)
IGES Initial Graphics Exchange Specification (Generic)
IGF Metafile (Inset Systems)
IIF Interchange file (QuickBooks for Windows)
ILB Datafile (Scream Tracker)
ILBM Bitmap (graphic image)
ILK Program outline (Microsoft ILink incremental linker)
IM8 Raster graphic (Sun Microsystems)
IMA Image (WinImage)
IMA Vector graphic (EGO,Chart)
IMG Image (GEM)
IMG Bitmap graphic (Ventura Publisher)
IMP Spreadsheet (Lotus Improv)
IMQ Image presentation (ImageQ)
IN$ Installation file (HP NewWave)
IN3 Input device driver (Harvard Graphics v3.0)
INB Test script (Vermont High Test)
INC Include file (Assembler language or Active Server)
IND Index (dBase IV)
INF Information file (Generic)
INF Type I LaserJet font information file
INF Install script (Generic)
INI Initialization file (Generic)
INI Setup file (MWave DSP synth's mwsynth.ini GM)
INI Bank setup file (Gravis UltraSound)
INK Pantone reference fills file (CorelDRAW)
INP Source code for form, (Oracle,version 3.0 and earlier)
INRS INRS-Telecommunications audio
INS Install script (InstallShield)
INS Sign-up file (X-Internet)
INS Instrument file (Ensoniq EPS Family)
INS Sample (Cell/II MAC/PC instruments)
INS Datafile (Microsoft WordPerfect for Windows)
INS Installation script (1st Reader)
INS Instrument music file (Adlib)
INT Intermediate executable code (Produced when a source program is syntax-checked)
INT Interfaced units (Borland)
INX Index file (Foxbase)
IO Compressed archive (CPIO)
IOB 3D graphics database (TDDD format)
IOC Organizational chart (Instant ORGcharting!)
IOF Findit document (Microsoft Findit)
ION File description (4dos descript.ion)
IPL Pantone Spot reference pallette (CorelDRAW)
IQY Internet inquiry (Microsoft)
ISO Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
IRS Resource file (Microsoft WordPerfect for Windows)
ISD Spell checker dictionary (RapidFile)
ISH Compressed archive (ISH)
ISO ISO (International Standards Organization table, aka: ISO)
ISP Sign-up file(X-Internet)
IST Instrument file (Digitaltracker)
ISU Uninstall script (InstallShield)
IT Settings file (intalk)
ITF Interface file (JPI Pascal TopSpeed)
IT Music module (MOD) (Impulse Tracker)
ITI Instrument file (Impulse Tracker)
ITS Sample file (Impulse Tracker)
ITS Internet document set (possibly a Microsoft file)
IV Open Inventor file
IVD Microdata dimension or variable-level file (Beyond 20/20)
IVP User subset profile (Beyond 20/20)
IVT Table or aggregate data (Beyond 20/20)
IVX Microdata directory (Beyond 20/20)
IW Screensaver (Idlewild)
IW Presentation flowchart (IconAuthor-HSC Interactive)
IWA Text file (IBM Writing Assistant)
IWC Install Watch document
IWP Text file (Wang)
IZT Binary token file (IZT)


JAR Java ARchive (a compressed file for applets and related files)
JAS Graphic (Generic)
JAVA Source code (Java)
JBD Datafile (SigmaScan)
JBF Image browser file (Paint Shop Pro)
JBX Project file (Project Scheduler 4.0)
JFF JPEG image
JIF JPEG image
JMP Discovery chart-to-statistics (SAS JMP)
JN1 Jill of the Jungle data (Epic MegaGames)
JOR Journal (Microsoft SQL Server)
JOU Journal backup (VAX Edt editor)
JPC Graphic (Japan PIC)
JPE JPEG image
JPEG JPEG compressed bitmap
JPG JPEG bitmap
JS JavaScript source code
JSP A HTML page containing a reference to a Java servlet
JTF JPEG bitmap
JTF Fax document (Hayes JT Fax)
JTF Bitmap graphic (JPEG Tagged Interchange Format)
JW Text document (JustWrite)
JWL Library (JustWrite)
JZZ Spreadsheet (Jazz)
J62 Ricoh camera file


K25 Kurzweil 2500 sample
KAR Karaoke MIDI file (text+MIDI)
KDC Kodak Photo-Enhancer
KEY DataCAD Icon toolbar file
KFX KoFax Group 4 image
KIZ Kodak digital postcard files
KKW Contains all K-keywords in the RoboHELP Help project Index Designer not associated with topics
KMP Korg Trinity KeyMaP file
KQP Konica camera native files
KR1 Kurzweil 2000 sample (multi-floppy)
KRZ Kurzweil 2000 sample
KSF Korg Trinity Sample File
KYE Kye game data


LBM Deluxe Paint bitmap
LBT Microsoft FoxPro labels
LBX Microsoft FoxPro labels
LDB Microsoft Access lock file
LDL Corel Paradox Delivered library
LEG Legacy document
LES Logitech Entertainment system game profiles (same as REG file)
LFT 3D Studio (DOS) loft file
LGO Paintbrush logo file
LHA Alternate file suffix for LZH
LIB Library
LIN DataCAD Line type file
LIS Output file produced by a Structured Query Reporting (SQR) program
LLX Laplink Exchange Agent
LNK Windows shortcut file
LOG Log file
LPD Helix Nuts and Bolts file
LRC Intel Video Phone file
LSL Corel Paradox Saved library
LSP AutoLISP, CommonLISP, and othe LISP language files
LST List file
LU ThoughtWing Library Unit file
LVL Parallax Software's Miner Descent/D2 Level Extension
LWLO Lightwave Layered Object file
LWOB Lightwave Object file
LWP Lotus Wordpro 96/97 file
LWSC Lightwave Scene file
LYR DataCAD Layer file
LZH LH ARC compressed archive
LZS Skyroads data file


M1V MPEG-related file (MIME type 'mpeg')
M3D Corel Motion 3D animation
M3U MPEG URL (MIME audio file)
MAT Matlab variables binary file
MAC MacPaint image
MAD Microsoft Access module
MAF Microsoft Access Form
MAG A graphics file format found in some Japanese files
MAGIC Magic Mail Monitor configuration file
MAK Visual Basic or MS Visual C++ Project
MAM Microsoft Access Macro
MAN Unix Manual page output
MAP Map file
MAP Duke Nukem 3D WAD game file
MAQ Microsoft Access Query
MAR Microsoft Access Report
MAS Lotus Freelance Graphics Smartmaster file
MAT Microsoft Access Table
MAUD MAUD sample format
MAX KINETIX's 3D Studio MAX file format for a 3D scene
MAX Paperport file
MAX OrCAD layout file
MAZ Hover maze data
MAZ A file format use by Division's dVS/dVISE
MB1 Apogee Monster Bash data file
MBOX Berkeley Unix mailbox format
MBX Extension Microsoft Outlook adds to saved email, Eudora mailboxes
MCC Dialer10 calling card
MCC Dialer10 calling card
MCP metrowerks CodeWarrior project file
MCR DataCAD Keyboard macro file
MCW Microsoft Word for Macintosh document
MDA Microsoft Access add-in
MDA Microsoft Access workgroup for version 2
MDB Microsoft Access database
MDE Microsoft Access MDE file
MDL Digital Tracker music module (MOD) file
MDL Quake model file
MDN Microsoft Access blank database template
MDW Microsoft Access Workgroup
MDZ Microsoft Access wizard template
MED Music Editor, OctaMED music module (MOD) file
MER Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
MET Presentation Manager metafile
MFG Pro/ENGINEER manufacturing file
MGF A file in a Materials and Geometry Format
MHTM MHTML document (MIME)
MI Miscellaneous
MIC Microsoft Image Composer file
MID MIDI music
MIF Adobe FrameMaker Interchange Format
MIFF Machine Independent Format File
MIM A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MIM file can be "opened" (unarchived and separated into individual files) using Winzip or a similar program.
MLI A file in 3D Studio's Material-Library format
MME A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MME file can be "opened" (unarchived and separated into individual files) using Winzip or a similar program.
MMF Meal Master Format, a recipe catologing format
MMF Microsoft Mail File
MMG Beyond 20/20 table or aggregate data file
MMM Microsoft Multimedia Movie
MMP Mindmapor MindManager file
MN2 Descent2 Mission File
MND, MNI Mandelbrot for Windows
MNG Multi-image Network Graphics
MNT Microsoft FoxPro menus
MNU Visual dBASE menu file
MNU Intertel Systems Interact menu file
MNX Microsoft FoxPro menus
MOD Music module file
MOD Microsoft Multiplan spreadsheet
MOD Amiga/PC tracker module
MOV QuickTime for Windows movie
MP2 MPEG Audio Layer 2
MP3 MPEG Audio Layer 3 (AC3)
MPA MPEG-related file (MIME type 'mpeg')
MPE MPEG animation
MPEG MPEG animation
MPG MPEG animation
MPP Microsoft Project file
MPP CAD drawing file format
MPR Microsoft FoxPro menus (compiled)
MP2 MPEG Audio Layer 2 file (MIME video file)
MP3 MPEG Audio Layer 3 (AC3) file
MSA Magic Shadow Archive
MSDL Manchesters Scene Description Language
MSG Microsoft Mail message
MSI Windows Installer package
MSN Microsoft Network document
MSN Descent Mission File
MSP Microsoft Paint bitmap
MSP Windows Installer patch file
MST Windows Installer transform
MTM MultiTracker music module (MOD) file
MUL Online game called Ultima online
MUS Music
MUS10 Mus10 audio
MVB Microsoft Multimedia Viewer file
MWP Lotus Wordpro 97 Smartmaster file


NAN Nanoscope files (Raw Grayscale)
NAP NAP Metafile
netCDF network Common Data Form
NCB Microsoft Developer Studio file
NCD Norton Change Directory
NCF Netware Command File
NCF Lotus Notes internal clipboard
NDO 3D low-polygon modeler, Nendo
NFF Neutral File Format
NFT NetObject Fusion template file
NIL Norton Icon Library file (EasyIcons-compatible)
NIST NIST Sphere audio
NLB Oracle 7 data
NLM Netware Loadable Module
NLS National Language Support file used for localization (for example, by Uniscape)
NLU Norton Live Update E-Mail Trigger file
NOD NetObject Fusion file
NSF Lotus Notes database
NSO NetObject Fusion document file
NST Noise Tracker music module (MOD) file
NS2 Lotus Notes database (version 2)
NTF Lotus Notes database template
NTX CA-Clipper index file
NWC Noteworthy Composer song file
NWS Microsoft OutlookExpress news message (MIME RFC822)


O01 Typhoon voice file
OBD Microsoft Office binder template
OBD Microsoft Office Binder
OBJ Object file
OBZ Microsoft Office Binder Wizard
OCX Microsoft Object Linking and Embedding custom control
ODS Microsoft Outlook Express mailbox file (?)
OFF 3D mesh Object File Format
OFN Microsoft Office FileNew file
OFT Microsoft Outlook template
OKT Oktalyzer music module (MOD) file
OLB OLE Object Library
OLE OLE object
OOGL Object Oriented Graphics Library
OPL Organiser Programming Language source file - Psion/Symbian
OPO OPL output executable file
OPT Microsoft Developer Studio file


P3 Primavera Project Planner file
P10 Tektronix Plot 10 drawing
P65 Pagemaker 6.5 file
P7C Digital ID file (MIME)
PAB Microsoft Personal Address Book
PAC SB Studio II package
PAK Quake WAD file
PAL A compressed file
PAS Pascal source code (Borland)
PAT DataCAD Hatch pattern file
PAT Corel Draw pattern
PAT Advanced Gravis Ultrasound/Forte tech. Patch
PBD PowerBuilder Dynamic library, an alternative to a native DLL
PBF Turtle Beach Pinnacle Bank File
PBK Microsoft Phonebook
PBL PowerBuilder Library used in the PowerBuilder development environment
PBM Portable bitmap
PBR PowerBuilder Resource
PCD Kodak Photo-CD image
PCD P-Code compiled test scripts as in Microsoft Tst and Microsoft Visual Test
PCE Maps Eudora mailbox names to DOS filenames
PCL Hewlett-Packard Printer Control Language file (printer-ready bitmap)
PCM Audio file format
PCM OKI MSM6376 synth chip PCM format
PCP Symantec Live Update Pro file
PCS PICS animation
PCT Macintosh PICT drawing
PCX ZSoft PC Paintbrush bitmap
PDB 3Com Palmpilot database file
PDD Graphic image that can be opened with Paint Shop Pro and possibly other image software
PDF Adobe Acrobat Portable Document Format file (displayable with a Web browser)
PDF Microsoft Systems Management Server Package Definition File  
PDF Netware Printer Definition File
PDP Broderbund's Print Shop Deluxe file
PDQ Patton&Patton Flowcharting PDQ Lite file
PDS Photographic image file (origin not yet identified)
PF Aladdin Systems Private Files encrypted file
PFA Type 1 font (ASCII)
PFB Type 1 font (binary)
PFC PF Component
PFM Printer Font Metrics
PGL HP Plotter drawing
PGM Portable Graymap (bitmap)
PGP PGP encrypted file
PH Temporary file generated by Microsoft Help Compiler
PHP HTML page that includes a PHP script
PHP3 HTML page that includes a PHP script
PHTML HTML page that includes a PHP script
PHTML Perl-parsed HTML
PIC PC Paint bitmap
PIC Lotus picture
PIC Macintosh PICT drawing
PICT Mac PICT image file
PIF Program Information File
PIF IBM PIF drawing
PIG Lucas Arts Dark Forces WAD file
PIN Epic Pinball data file
PIN Epic Pinball data file
PIX Inset Systems bitmap
PJ MKS Source Integrity file
PJX Microsoft's Visual Foxpro Project
PJT Microsoft's Visual Foxpro Project
PKG Microsoft Developer Studio application extension (similar to a DLL file)
PKR PGP Public Keyring
PL Perl program
PLG A file format use by REND386/AVRIL
PLI Oracle 7 data description
PLM DisorderTracker2 module
PLS DisorderTracker2 sample
PLS MPEG PLayList file (used by WinAmp)
PLT HPGL Plotter drawing
PLT AutoCAD Plot drawing
PLT Gerber sign-making software
PM5 Pagemaker 5.0 file
PM6 Pagemaker 6.0 file
PNG Portable Network Graphics bitmap
PNG Paint Shop Pro Browser catalogue
PNT MacPaint graphic file
PNTG Same as PNT file
POG Descent2 PIG file extension
POL Windows NT Policy file
POP Visual dBASE popup file
POT Microsoft PowerPoint Template
POV Persistence of Vision ray-tracer
PP4 Picture Publisher 4 bitmap
PPA Microsoft PowerPoint Add-in
PPF Turtle Beach Pinnacle Program File
PPM Portable Pixelmap bitmap
PPP Parson Power Publisher
PPP Serif PagePlus desktop publishing default output
PPS Microsoft PowerPoint slide show
PPT Microsoft PowerPoint presentation
PRC 3Com Palmpilot resource (text or program) file
PRE Lotus Freelance presentation
PRF Windows system file
PRF Macromedia Director settings file
PRG dBase, Clipper, and FoxPro program source files
PRG WAVmaker program
PRJ 3d Studio (DOS) project file
PRN Print Table (space delimited text)
PRN DataCAD Windows Printer file
PRP Oberon's Prospero data conversion product saved project file
PRS Harvard Graphics for Windows presentation
PRT A print-formatted file
PRT Pro/ENGINEER part file
PRV A PsiMail Internet provider template file
PRZ Lotus Freelance Graphics 97 file
PS Postscript-formatted file (a Postscript printer-ready file)
PSB Pinnacle Sound Bank
PSD Adobe Photoshop bitmap
PSI PSION a-law audio
PSM Protracker Studio Module format
PSM Sound data for Epic's games
PSP Paintshop Pro image file
PST Microsoft Outlook Personal Folder File
PTD Pro/ENGINEER table file
PTM Polytracker music module (MOD) file
PUB Ventura Publisher publication
PUB Microsoft Publisher document
PWD Microsoft Pocket Word document
PWL Windows 95 password list file
PWP Photoworks image file (a roll of file that can be viewed using Photoworks)
PWZ Microsoft PowerPoint Wizard
PXL Microsoft Pocket Excel spreadsheet
PY Save emessages from Yahoo
PY Python script file
PYC Python script file


QAD PF QuickArt Document
QBW QuickBooks for Windows file
QDT Quick Books data file from the Quicken UK Accountancy/Tax/Invoice program
QD3D Apple's QuickDraw 3D Metafile format
QIC Microsoft Backup file
QIF QuickTime-related image (MIME)
QIF Quicken Import File
QLB Quick Library
QM Quality Motion file
QRY Microsoft Query
QST Quake Spy Tab file
QT QuickTime Movie
QTI QuickTime-related image
QTIF QuickTime-related image
QTM QuickTime Movie
QTP QuickTime Preferences file
QTS Mac PICT image file
QTS QuickTime-related image
QTX QuickTime-related image
QW Symantec Q&A Write program file
QXD Quark XPress file


R Pegasus Mail resource file
RA Real Audio sound
RAM RealAudio metafile
RAR RAR compressed archive (Eugene Roshall's format)
RAS Sun Raster Images bitmap
RAW Raw File Format (bitmap)
RAW Raw signed PCM data
RAW Raw signed PCM data
RBH Maintained by RoboHELP, the RBH file adds to the information contained in the Help project file
RDF Resource Description Framework file (related to XML and metadata)
RDL Descent Registered Level
REC Recorder macro
REC RapidComm voice file
REG Registration file
REP Visual dBASE report file
RES Microsoft Visual C++ Resource
Silicon Graphics RGB files


S Assembler source code
S3I Scream Tracker v3 instrument
S3M Sound module file for ScreamTracker v3
SAM Ami Professional document
SAM Signed 8bit sample data
SAV Saved game file
SB Raw Signed Byte (8bit) data
SBK Creative Labs Soundfont 1.0 Bank file (Soundblaster)/EMU SoundFont v1.x Bank files
SBL Shockwave Flash object
SC2 Microsoft Schedule+ 7 file format
SC2 SAS catalog (Windows 95/NT, OS/2, Mac)
SC3 SimCity 3000 saved game file
SCC Microsoft Source Safe file
SCD Matrix/Imapro SCODL slide image
SCD Microsoft Schedule+ 7
SCF Windows Explorer command file
SCH Microsoft Schedule+ 1
SCI ScanVec Inspire Native file format
SCN trueSpace2 scene
SCP Dial-Up Networking Script
SCR Windows screensaver
SCR Fax image
SCT SAS catalog (Dos)
SCT Scitex CT bitmap
SCT Microsoft FoxPro forms
SCT01 SAS catalog (Unix)
SCV ScanVec CASmate Native file format
SCX Microsoft FoxPro forms
SD Sound Designer I audio
SD2 Sound Designer 2 flattened file/data fork
SD2 SAS database (Windows 95/NT OS/2, Mac)
SDF System Data File Format - legacy Unisys (Sperry) format
SDK Roland S-series floppy disk image
SDL SmartDraw library
SDR SmartDraw drawing
SDS Raw Midi Sample Dump Standard file
SDT SmartDraw template
SDV Semicolon Divided Values file
SDW Lotus WordPro graphic file
SDW Raw Signed DWord (32bit) data
SDX Midi Sample Dump Standard files compacted by SDX
SEA Self-expanding archive (used by Stuffit for Mac files and possibly by others)
SEP Tagged Image File Format (TIFF) bitmap
SES Cood Edit Session file (common digital audio editor file )
SF IRCAM SoundFile format
SF2 Emu SoundFont v2.0 file
SFD SoundStage Sound File Data
SFI SoundStage Sound File Info
SFR Sonic Foundry Sample Resource
SFW Seattle Film Works (Mangled JPEG)
SFX RAR self-extracting archive
SF2 Creative Labs Soundfont 2.0 Bank file (Soundblaster)
SGML Standard Generalized Markup Language
SHB Corel Show presentation
SHB Document shortcut file
SHG Hotspot bitmap
SHP 3D Studio (DOS) shapes file
SHP File format used by some programs for 3D modeling of multipart interactive triangle models
SHS Shell scrap file; reportedly used to send "password stealers"
SHW Corel Show presentation
SIG Signature file
SHTML HTML file containing Server Side Includes (SSI)
SIT Stuffit archive of Mac files
SIZ Oracle 7 configuration
SKA PGP secret Keyring
SKL Macromedia Director resource file
SL PACT's Save Layout extension
SLB AutoDesk Slide Library File Format
SLD AutoDesk Slide File Format
SLK Symbolic Link (SYLK) spreadsheet
SM3 DataCAD Symbol file
SMP Samplevision format
SMP Ad Lib Gold Sample
SND NeXT sound
SND Mac Sound Resource
SND Raw unsigned PCM data
SND AKAI MPC-series sample
SNDR Sounder sound file
SNDT Sndtool sound file
SNM Netscape mailbox (mail folder) index  
SOU SB Studio II sound
SPD Speach Data file
SPL Shockwave Flash Object
SPL Digitracker Sample
SPPACK SPPack sound sample
SPRITE Acorn's bitmap format
SQC Structured Query Language (SQR) common code file
SQL Informix SQL queries
SQL Generally used by database products as an extension for SQL queries (scripts, text, or binary)
SQR Structured Query Language (SQR) program file
SSD01 SAS data sets (Unix)
SSD SAS database (Dos)
SSF Enable spreadsheet file
STL Stereolithography file
STM Shorter suffix for .shtml, an HTML file containing a server side include SSI
STM Scream Tracker v2 music module (MOD) file
ST Atari ST disk image
STR Screensaver file
STY Ventura Publisher style sheet
SVX Amiga 8SVX sound
SVX Interchange file format, 8SVX/16SV
SW Raw signed Word (16bit) data
SWA Shockwave audio file in Macromedia Director (an MP3 file)
SWF Shockwave Flash object
SWP DataCAD Swap file
SYS System file
SYW Yamaha SY-series wave files


T64 Commodore 64 emulator tape image file
TAB Guitar Tablature file
TAR Tape Archive
TAZ Unix Gzip/Tape Archive
TBK Asymetrix Toolbook interactive multimedia files
TCL Script in the TCL/TK Language
TDB Thumbs Plus database
TDDD A file format use by the Imagine & Turbo Silver ray-tracers
TEX Texture file
TGA Targa bitmap
TGZ Unix Gzip/Tape Archive
THEME Windows 95 Desktop Theme
THN Graphics Workshop for Windows thumbnail
TIF Tag Image File Format (TIFF) bitmap
TIFF Tag Image File Format (TIFF) bitmap
TIG Tiger file, used by US government to distribute maps
TLB OLE Type Library
TLE Two-Line Element set (NASA)
TMP Windows temporary file
TOC Table of contents of Eudora mailboxes
TOL Kodak photoenhancer
TOS The Operation System for Atari line of 16/32 and 32/32 computers
TPL CakeWalk Audio Template file
TPL DataCAD Template file
TPP Teleport Pro Project
TRK Kermit scrpit file
TRM Terminal file
TRN MKS Source Integrity project usage log
TTF TrueType font
TTK Corel Catalyst Translation Tool Kit
TWF TabWorks file
TWW Tagwrite Template
TX8 MS-DOS text
TXB Descent/D2 Encoded Briefing File
TXT ASCII text-formatted audio data
TXW Yamaha TX16W wave files
TZ Old compression format file
T2T Sonata CAD modelling software file


UB Raw unsigned byte (8-bit) data
UDF Windows NT Uniqueness Database File
UDW Raw unsigned doubleword (32-bit) data
ULAW US telephony format (CCITT G.711) audio
ULT Ultratracker music module (MOD) file
UNI MikMod UniMod formatted file
URL Internet shortcut file
USE MKS Source Integrity file
UU UU-encoded file
UUE UU-encoded file
UW Raw unsigned word (16-bit) data
UWF UltraTracker Wave file


V8 Covox 8-bit audio file
VAP Annotated speech
VBA VBase file
VBP Visual Basic Project
VBW Microsoft Visual Basic workspace
VBX Visual Basic custom control
VCE Natural MicroSystems (NMS) unformatted voice file (used by Cool Edit)
VCF Virtual card file (Netscape)
VCF Vevi configuration file; defines objects for use with Sense8's WorldToolKit
VCT Microsoft FoxPro class library
VCX Microsoft FoxPro class library
VDA Targa bitmap
VI Virtual Instrument file from National Instruments LABView product
VIFF Khoros Visualisation format
VIR File identified as a virus-infected file by Norton AntiVirus and possibly others
VIV VivoActive Player streaming video file
VIZ Division's dVS/dVISE file
VLB Corel Ventura Library
VMF FaxWorks audio file
VOC Creative Labs Sound Blaster audio file
VOX Dialogic audio file coded using ADPCM
VOX Natural MicroSystems (NMS) formatted voice file
VOX Talking Technology audio file
VP Ventura Publisher publication
VQE Yamaha Sound-VQ Locator file
VQF Yamaha Sound-VQ file (possible emerging standard)
VQL Yamah Sound-VQ Locator file
VRF Oracle 7 configuration
VSD Visio drawing (flow chart or schematic)
VSL Download List file (GetRight)
VSN A Windows 9x/NT ViruSafe version file; used to keep information about all the files in a directory; when a file is accessed, information is compared with the VSN information to ensure that they match
VSS Visio Stencil file
VST Targa bitmap
VSW Visio Workspace file
VXD Microsoft Windows virtual device driver


W3L W3Launch file
WAB Microsoft Outlook file
WAD Large file for Doom game containing video, player level, and other information
WAL Quake 2 texture file
WAV Windows Waveform sound
WB1 QuattroPro for Windows spreadsheet
WB2 QuattroPro for Windows spreadsheet
WBK Microsoft Word Backup
WBL Argo WebLoad II upload file
WBR Crick Software WordBar File
WBT Crick Software Wordbar Template
WCM WordPerfect Macro
WDB Microsoft Works database
WDG Warftpd remote daemon file
WEB CorelXara Web document
WFB Turtle Beach WaveFront Bank (Maui/Rio/Monterey)
WFD Turtle Beach WaveFront Drum set (Maui/Rio/Monterey)
WFM Visual dBASE Windows form
WFN symbols for use in Corel Draw
WFP Turtle Beach WaveFront Program (Maui/Rio/Monterey)
WGP Wild Board Games data file
WID Ventura width table
WIL WinImage file
WIZ Microsoft Word Wizard
WK1 Lotus 123 versions 1 & 2 spreadsheet
WK3 Lotus 123 version 3 spreadsheet
WK4 Lotus 123 version 4 spreadsheet
WKS Lotus 123 Worksheet spreadsheet
WKS Microsoft Works document
WLF Argo WebLoad I upload file
WLL Microsoft Word Add-In
WMF Windows Metafile
WOW Grave Composer music module (MOD) file
WP WordPerfect document
WPW Novel PerfectWorks document
WP4 WordPerfect 4 document
WP5 WordPerfect 5 document
WP6 WordPerfect 6 document
WPD WordPerfect Demo
WPF Enable word processing document
WPD WordPerfect Document
WPG WordPerfect Graphic
WPS Microsoft Works document
WPT WordPerfect Template
WQ1 QuattroPro/DOS spreadsheet
WQ2 QuattroPro/DOS version 5 spreadsheet
WR1 Lotus Symphony
WRG ReGet document
WRI Write document
WRK Cakewalk music audio project file
WRL Virtual Reality model
WRZ Another VRML fileject
WS1 WordStar for Windows 1 document
WS2 WordStar for Windows 2 document
WS3 WordStar for Windows 3 document
WS4 WordStar for Windows 4 document
WS5 WordStar for Windows 5 document
WS6 WordStar for Windows 6 document
WS7 WordStar for Windows 7 document
WSD WordStar 2000 document
WVL Wavelet Compressed Bitmap
WWL Microsoft Word add-in file


X AVS image format
XAR Corel Xara drawing
XBM A MIME 'xbitmap' image
XI Instrument sample file for ScreamTracker
XIF Wang imaging file (comes with Windows 95)
XLA Microsoft Excel add-in
XLB Microsoft Excel toolbar
XLC Microsoft Excel chart
XLD Microsoft Excel dialogue
XLK Microsoft Excel backup
XLL Microsoft Excel add-in file
XLM Microsoft Excel macro
XLS Microsoft Excel worksheet
XLT Microsoft Excel template
XLV Microsoft Excel VBA module
XLW Microsoft Excel workbook / workspace
XM FastTracker 2, Digital Tracker music module (MOD) file
XNK Microsoft Exchange shortcut file
XPM X BitMap format
XR1 Epic MegaGames Xargon data file
XTP XTree data file
XWD X Window Dump format
XWF Yamaha XG Works file (MIDI sequencing)
XY3 XYWrite III document
XY4 XYWrite IV document
XYP XYWrite III Plus document
XYW XYWrite for Windows 4.0 document
X16 Macromedia Extra (program extension), 16 bit
X32 Macromedia Extra (program extension), 32 bit


YAL Arts & Letters clipart library
YBK Microsoft Encarta Yearbook


Z Unix Gzip
ZAP Windows software installation settings file
ZIP Zip file
ZOO An early compressed file format


12M Lotus 123 97 Smartmaster file
123 Lotus 123 97 file
2D VersaCAD two-dimensional drawing file
2GR / 3GR VGA Graphics driver/configuration files under Windows
3D VersaCAD three-dimensional drawing file
3DM 3D NURBS modeler, Rhino
3DS A file in 3D Studio (for DOS) format
386 A file for use in an 80386 or higher microprocessor
4GE Informix 4GL compiled code
4GL Informix 4GL source code
669 Composer 669, Unis Composer music mod file
669 669 tracker module
#01>  A method of numbering picture files for a roll of film that has been scanned for computer presentation
$$$ Used by OS/2 to keep track of archived files
@@@ Screen files used in the installation and instruction on use of such applications as Microsoft Codeview for C





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