FILE EXTENSIONS

ABK	Corel Draw AutoBackup
ACL	Corel Draw 6 keyboard accelerator
ACM	Used by Windows in the system directory
ACP	Microsoft Office Assistant Preview file
ACT	Microsoft Office Assistant Actor file
ACV	OS/2 drivers that compress and decompress audio data
AD	After Dark screensaver
ADB	Appointment database used by HP 100LX organizer
ADD	OS/2 adapter drivers used in the boot process
ADM	After Dark MultiModule screensaver
ADP	Used by FaxWorks to do setup for fax modem interaction
ADR	After Dark Randomizer screensaver
AFM	Adobe font metrics
AF2	ABC Flowchart file
AF3	ABC Flowchart file
AI	Adobe Illustrator drawing
AIF	Apple Mac AIFF sound
ALB	JASC Image Commander album
ALL	Arts & Letters Library
AMS	Velvert Studio music module (MOD) file
ANC	Canon Computer Pattern Maker file that is a selectable list of pattern colors
ANI	Animated Cursor
ANS	ANSI text
API	Application Program Interface file; used by Adobe Acrobat
APR	Lotus Approach 97 file
APS	Microsoft Visual C++ file
ARC	LH ARC (old version) compressed archive
ARJ	Robert Jung ARJ compressed archive
ART	Xara Studio drawing
ART	Canon Crayola art file
ASA	Microsoft Visual InterDev file
ASC	ASCII text
ASD	WinWord AutoSave
ASM	Assembler language source file
ASP	Active Server Page (an HTML file containing a Microsoft server-processed script)
ASP	Procomm Plus setup and connection script
AST	Claris Works "assistant" file
ATT	AT&T Group 4 bitmap
AVI	Microsoft Video for Windows movie
AWD	FaxView document

 

BAK	Backup file
BAS	BASIC code
BAT	Batch file
BFC	Windows 95 Briefcase document
BG	Backgammon for Windows game
BI	Binary file
BIF	GroupWise initialization file
BIN	Binary file
BK	Sometimes used to denote backup versions
BK$	Also sometimes used to denote backup versions
BKS	An IBM BookManager Read bookshelf
BMK	An A bookmark file
BMP	Windows or OS/2 bitmap
BM1	Apogee BioMenace data file
BRX	A file for browsing an index of multimedia options
BSP	Quake map
BS1	Apogee Blake Stone data file
BTM	Batch file used by Norton Utilities
B4	Helix Nuts and Bolts file

 

C	C code
CAB	Microsoft cabinet file (program files compressed for software distribution)
CAL	CALS Compressed Bitmap
CAL	Calendar schedule data
CAS	Comma-delimited ASCII file
CAT	IntelliCharge categorization file used by Quicken
CB	Microsoft clean boot file
CCB	Visual Basic Animated Button configuration
CCF	Multimedia Viewer configuration file used in OS/2
CCH	Corel Chart
CCM	Lotus CC:Mail "box" (for example, INBOX.CCM)
CDA	CD Audio Track
CDF	Microsoft Channel Definition Format file
CDI	Phillips Compact Disk Interactive format
CDR	Core Draw drawing
CDT	Corel Draw template
CDX	Corel Draw compressed drawing
CEL	CIMFast Event Language file
CFB	Comptons Multimedia file
CFG	Configuration file
CGI	Common Gateway Interface script file
CGM	Computer Graphics Metafile
CH	OS/2 configuration file
CHK	File fragments saved by Windows Disk Defragmenter or ScanDisk
CHP	Ventura Publisher chapter
CIL	Clip Gallery download package
CIM	Sim City 200 file
CIN	OS/2 change control file that tracks changes to an INI file
CK1	iD/Apogee Commander Keen 1 data file
CK2	iD/Apogee Commander Keen 2 data file
CK3	iD/Apogee Commander Keen 3 data file
CK4	iD/Apogee Commander Keen 4 data file
CK5	iD/Apogee Commander Keen 5 data file
CK6	iD/Apogee Commander Keen 6 data file
CLASS	Java class
CLP	Windows Clipboard file
CLS	Visual Basic Class Module
CMD	Command file for Windows NT (similar to a DOS .BAT file)
CMD	DOS CP/M command file
CMD	dBase-II program file
CMF	Corel Metafile
CMP	JPEG Bitmap
CMP	Address document
CMV	Corel Move animation
CMX	Corel Presentation Exchange image
CNF	Configuration file used by Telnet, Windows, and other applications
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
COB	trueSpace2 object
COD	Microsoft C compiler output as displayable assembler with original C as comments
COM	Command file (program)
CPD	Fax Cover document
CPE	Fax Cover document
CPI	Microsoft MS-DOS code page information file
CPL	Control Panel extension
CPL	Corel colour palette
CPP	C++ code
CPR	Corel Presents Presentation
CPT	Corel Photo-Paint image
CPX	Corel Presentation Exchange Compressed drawing
CRD	Cardfile file
CRP	Corel Presents Run-Time Presentation
CRT	Certificate file
CSC	Corel Script
CSP	PC Emcee On-Screen image
CSV	Comma-separated values file
CT	Scitex CT Bitmap
CTL	Used in general to mean a file containing control information.
CUE	Microsoft Cue Cards data
CUR	Windows Cursor
CUT	Dr Halo bitmap
CV	Corel Versions archive
CV	Microsoft CodeView information screen
CWK	Claris Works data file
CWS	Claris Works template
CXX	C++ source code file

 

DAT	Data file
DAT	WordPerfect Merge Data
DBF	Aston-Tate dBASE database
DBX	DataBeam image
DCR	Shockwave file
DCS	Desktop Color Separation file
DCX	Fax image (based on PCX)
DDF	BTRIEVE database
DEF	SmartWare II data file
DEF	C++ Definition
DER	Certificate file
DIB	Device-Independent Bitmap
DIC	Dictionary
DIF	Data Interchange Format spreadsheet
DIR	Macromedia Director file
DIZ	Description file
DLG	C++ Dialogue Script
DLL	Dynamic-Link Library
DMF	X-Trakker music module (MOD) file
DOC	FrameMaker or FrameBuilder document
DOC	WordStar document
DOC	WordPerfect document
DOC	Microsoft Word document
DOT	Microsoft Word document Template
DPR	Borland Delphi project header file
DRV	Driver
DRW	Micrografx Designer/Draw
DSG	DooM saved game
DSM	Dynamic Studio music module (MOD) file
DSP	Microsoft Developer Studio project
DSQ	Corel QUERY file
DSW	Microsoft Developer Studio workspace
DWG	AutoCAD drawing eXchange format
DXF	AutoDesk Drawing Interchange format

 

EMF	Enhanced Windows Metafile
ENC	Encore file
EPS	Encapsulated PostScript image
ER1	ERWin file
ERX	ERWin file
EVY	Envoy document
EWL	Microsoft Encarta document
EXE	Executable file (program)

 

F	FORTRAN file
F77	FORTRAN file
F90	FORTRAN file
FAR	Farandole Composer music module (MOD) file
FAV	Microsoft Outlook navigation bar
FAX	FAX Type image
FH3	Aldus Freehand 3 drawing
FIF	Fractal image file
FITS	CCD camera image
FLC	AutoDesk FLIC animation
FLI	AutoDesk FLIC animation
FLT	Corel filter
FLT	StarTrekker music module (MOD) file
FMB	Oracle binary source code for form, version 4.0 and later
FMT	Oracle text format of form, version 4.0 and later
FMT	Microsoft Schedule+ print file
FMX	Oracle executable form, version 4.0 and later
FOG	Fontographer font
FON	System font
FOR	FORTRAN file
FOT	Font-related file
FP	FileMaker Pro file
FP1	Flying Pigs for Windows data file
FP3	FileMaker Pro file
FPX	FlashPix bitmap
FRM	Form
FRM	FrameMaker or FrameBuilder document
FRM	Oracle executable form version 3.0 and earlier
FRM	Visual Basic form
FRM	WordPerfect Merge form
FRX	Visual Basic form stash file

 

GAL	Corel Multimedia Manager album
GCP	Ground Control Point file used in image processing of remote sensing data .
GED	Graphic Environment Document (drawing)
GEM	GEM metafile
GEN	Ventura-Generated text file
GFC	Patton&Patton Flowcharting 4 flowchart file
GFI	Genigraphics Graphics Link presentation
GFX	Genigraphics Graphics Link presentation
GID	Windows 95 global index file (containing help status)
GIF	CompuServe bitmap
GIM	Genigraphics Graphics Link presentation
GIX	Genigraphics Graphics Link presentation
GNA	Genigraphics Graphics Link presentation
GNX	Genigraphics Graphics Link presentation
GRA	Microsoft Graph
GRD	Grid file, used in image processing of remote sensing data often to form map projections.
GRP	Program Manager Group
GTK	Graoumftracker (old) music module (MOD) file
GT2	Graoumftracker (new) music module (MOD) file
GWX	Genigraphics Graphics Link presentation
GWZ	Genigraphics Graphics Link pres

 

H	C program header
HED	HighEdit document
HEL	Microsoft Hellbender saved game
HEX	Macintosh BinHex 2.0 file
HGL	HP Graphics Language drawing
HLP	Help file
HOG	Lucas Arts Dark Forces WAD file
HPJ	Visual Basic Help Project
HPP	C++ program header
HQX	Macintosh BinHex 4.0 file
HST	History file
HT	HyperTerminal
HTM	Hypertext document
HTML	Hypertext document
HTX	Extended HTML template

 

ICA	Citrix file
ICB	Targa bitmap
ICM	Image Color Matching profile file
ICO	Windows Icon
IDD	MIDI Instrument Definition
IDQ	Internet Data Query file
IFF	Amiga ILBM
IGF	Inset Systems metafile
IIF	QuickBooks for Windows interchange file
IMA	WinImage file
IMG	GEM image
INC	Assembler language or Active Server include file
INF	Information file
INI	Initialization file
INP	Oracle source code for form, version 3.0 and earlier
INS	InstallShield install script
INS	X-Internet sign-up file
ISO	Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
ISP	X-Internet sign-up file
ISU	InstallShield uninstall script
IT	Impulse Tracker music module (MOD) file
IW	Idlewild screensaver