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 @@@@
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 @@@@
ASD ::::::::::::::::::: WinWord AutoSave
ASM ::: Assembler @@@@@@@@ source file
ASP ::: Active Server Pagean HTML file containing a Microsoft server-processed @@@@@@
ASP :::::::::: Procomm Plus setup and connection @@@@@@
AST :::::::::::: Claris Works "assistant" file
ATT :::::::::: AT&T Group 4 bitmap
AVI ::::::::::::::: Microsoft Video for Windows movie
AWD :::::::::::::::: FaxView @@@@@@@@

BAK::: Backup file
BAS:::::: BASIC code
BAT:::::::: Batch file
BFC :::::::;Windows 95 Briefcase @@@@@@@@
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 book@@@@f
BMK :::::::::(IMG:style_emoticons/default/face5.gif)n 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 @@@@@@@@ file
CFB::::::::::; Comptons Multimedia file
CFG :::::::;;Configuration file
CGI ::::::::::Common Gateway Interface @@@@@@ file
CGM:::::::::: Computer Graphics @@@@file
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 @@@@file
CMP::::::::: JPEG Bitmap
CMP :::::::Address @@@@@@@@
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 @@@@@@@ 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 @@@@@@@@
CPE ::::::::::::Fax Cover @@@@@@@@
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 @@@@@@
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:::::::::: De@@@@@@ion file
DLG C++::::::::: Dialogue @@@@@@
DLL::::::::::: Dynamic-Link Library
DMF :::::::::X-Trakker music module (MOD) file
DOC ::::::::FrameMaker or FrameBuilder @@@@@@@@
DOC :::::::::WordStar @@@@@@@@
DOC :::::::::::WordPerfect @@@@@@@@
DOC::::::::::::: Microsoft Word @@@@@@@@
DOT:::::::::::::::: Microsoft Word @@@@@@@@ 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 @@@@file
ENC::::::::::::::: Encore file
EPS::::::::: Encapsulated Post@@@@@@ image
ER1:::::::::::::: ERWin file
ERX :::::::::::::ERWin file
EVY:::::::::::: Envoy @@@@@@@@
EWL:::::::::::: Microsoft Encarta @@@@@@@@
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 @@@@ 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 @@@@@@@@
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 @@@@@@@@ (drawing)
GEM ::::::::GEM @@@@file
GEN :::::::::;;Ventura-Generated @@@@ 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 presentation
GZ ::::::::::;Unix Gzip compressed file

H C:::::::::::: program header
HED::::::::: HighEdit @@@@@@@@
HEL::::::::; Microsoft Hellbender saved game
HEX:::::::::: Macintosh BinHex 2.0 file
HGL:::::::::::::;; HP Graphics @@@@@@@@ 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 :::::::::Hyper@@@@ @@@@@@@@
HTML:::::::; Hyper@@@@ @@@@@@@@
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 @@@@file
IIF::::::;; QuickBooks for Windows interchange file
IMA::::::::: WinImage file
IMG:::::::: GEM image
INC::::::::: Assembler @@@@@@@@ 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 @@@@@@
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 @@@@@@
IT :::::::;;Impulse Tracker music module (MOD) file
IW :::::::::Idlewild screensaver

JAR :::::::;;Java ARchive file (a compressed file for applets and related files)
JAVA::::::::::: Java source code
JBF::::::: Paint Shop Pro image browser file
JFF:::::::::::: JPEG bitmap
JIF::::::::::: JPEG bitmap
JMP ::::::::;SAS JMPDiscovery chart-to-statistics file
JN1 :::::::Epic MegaGames Jill of the Jungle data file
JPEG :::::::::JPEG bitmap
JPG::::::: JPEG bitmap
JS ::::::Java@@@@@@ source code
JTF::::::: JPEG bitmap