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
