A

B

BAK	Backup file
BAS	BASIC code
BAT	Batch File
BDF	extention for a program called West Point Bridge Designer
BFC	Windows 95 Briefcase document
BG	Backgammon for Windows game
BGL	from Microsoft concerning scenery files from the well known Flight Simulator
BI	Binary file
BIF	GroupWise initialization file
BIFF	XLITE 3D file format
BIN	Binary file
BK and BK$	Sometimes used to denote backup versions
BKS	An IBM BookManager Read bookshelf
BMK	A bookmark file
BMP	Windows or OS/2 bitmap
BM1	Apogee BioMenace data file
BOOK	Adobe FrameMaker Book
BOX	A mailbox in Notes
BPL	Borland Delphi 4 packed library
BQY	BrioQuery file
BRX	A file for browsing an index of multimedia options
BSC	MS Developer Studio (MSDev) browser informatio file
BSP	Quake map
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
BUN	CakeWalk Audio Bundle file (a MIDI program)
BW	SGI Black and White image file
BYU	A file in a Movie BYU format
B4	Helix Nuts and Bolts file
Return to Top

C

C	C code
C01	Typhoon wave files
CAB	Microsoft cabinet file (program files compressed for software distribution)
CAD	used by the drafting program "Drafix Cad">by Softdesk
CAL	CALS Compressed Bitmap
CAL	Calendar schedule data
CAM	Casio camera format
CAP	Compressed music file format
CAS	Comma-delimited ASCII file
CAT	IntelliCharge categorization file used by Quicken
CB	Microsoft clean boot file
CBI	Column binary formatted file (used in IBM mainframe systems)
CCA	cc:mail
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)
CCO	CyberChat data file
CCT	Macromedia Director Shockwave cast
CDA	CD Audio Track
CDF	Microsoft Channel Definition Format file
CDI	Phillips Compact Disk Interactive format
CDR	Core Draw drawing
CDR	Raw Audio-CD data
CDT	Corel Draw template
CDX	Corel Draw compressed drawing
CDX	Microsoft's Visual Foxpro Index
CEL	CIMFast Event Language file
CER	Certificate file (MIME x-x509-ca-cert)
CFB	Comptons Multimedia file
CFG	Configuration file
CFM	Cold Fusion template files
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
CHM	Compiled HTML file
CHR	Character Sets (Font files)
CHP	Ventura Publisher chapter
CHT	ChartViewer file
CHT	Harvard Graphics vector file
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
CLL	Crick Software Clicker File
CLP	Windows Clipboard file
CLS	Visual Basic Class Module
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
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 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
COB	trueSpace2 object
COD	Microsoft C compiler output as displayable machine language/assembler with original C as comments
COM	Command file (program)
CPD	Corel PrintOffice file (drawing)
CPD	Fax Cover document
CPE	Fax Cover document
CPI	Microsoft MS-DOS code page information file
CPL	Control Panel extension
CPL	Corel colour palette
CPO	Corel Print House file
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
CSS	Cascading Style Sheet file (MIME)
CST	Macromedia Director "Cast" (resource) file
CSV	Comma-separated values file
CT	Scitex CT Bitmap
CT	A graphic file associated with the Paint Shop Pro Graphic Editor
CTL	Used in general to mean a file containing control information. FAXWorks uses it to keep information about each fax sent and received.
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
CXT	Macromedia Director protected (not editable) "Cast" (resource) file
CXX	C++ source code file
Return to Top

D

DAT	Data file
DAT	WordPerfect Merge Data
DAT	Extension used for some MPEG formats
DB	Borderland's Paradox 7 tables
DBC	Microsoft's Visual Foxpro Database container
DBF	Aston-Tate dBASE database
DBX	DataBeam image
DBX	Microsoft's Visual Foxpro Table
DCM	DCM modle format
DCR	Shockwave file
DCS	Desktop Color Separation file
DCT	Microsoft's Visual Foxpro Database container
DCU	Delphi compiled unit file
DCX	Microsoft's Visual Foxpro Database container
DCX	Fax image (based on PCX)
DCX	Macros
DC5	DataCAD Drawing files
DDF	BTRIEVE database
DDIF	Digital Equipment or Compaq format. Used for storing images and their word processing documents
DEF	SmartWare II data file
DEF	C++ Definition
DEFI	Oracle 7 de-install script
DEM	A file with USGS standards for Digital Elevation Models
DER	Certificate file
DEWF	Macintosh SoundCap/SoundEdit recorded instrument format
DGN	Microstation95 CAD drawing file
DIB	Device-Independent Bitmap
DIC	Dictionary
DIF	Data Interchange Format spreadsheet
DIG	Digilink format
DIG	Sound Designer I audio file
DIR	Macromedia Director file
DIZ	Description file
DLG	C++ Dialogue Script
DLS	DownLoadable Sound
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
DOC	A DisplayWrite document
DOT	Microsoft Word document Template
DPL	Borland Delphi 3 packed library
DPR	Borland Delphi project header file
DRAW	Acorn's object-based vector image file
DRV	Driver
DRW	Micrografx Designer/Draw
DSF	Micrografx Designer v7.x
DSG	DooM saved game
DSM	Dynamic Studio music module (MOD) file
DSP	Microsoft Developer Studio project
DSQ	Corel QUERY file
DST	Embroidery machines graphics file
DSW	Microsoft Developer Studio workspace
DTD	SGML Document Type Definition (DTD) file
DTED	Digital terrain elevation data (geographic data format)
DTM	DigiTrakker module
DTF	Symantec Q&A relational database data file
DUN	Microsoft Dial-up Networking Export file
DV	Digital video file (MIME)
DWD	DiamondWare digitized file
DWG	Autocad Drawing files
DWG	AutoCAD drawing, or older Generic CADD drawing format
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
Return to Top

E

EDA	Ensoniq ASR disk image
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
EMD	ABT Extended MoDule
EMF	Enhanced Windows Metafile
EML	Microsoft Outlook Express mail message (MIME RFC 822)
ENC	Encore file
ENFF	Neutral File Format extension
EPHTML	Enhanced Perl-parsed HTML
EPS	Encapsulated PostScript image
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
ESPF	Encapsulated PostScript Files
ESPS	ESPS audio files
EUI	Ensoniq ESP family compacted disk image
EVY	Envoy document
EWL	Microsoft Encarta document
EXC	Microsoft Word Exclusion Dictionary
EXE	Executable file (program)
Return to Top

F

G

G721	Raw CCITT G.721 $bit ADPCM format data
G723	Raw CCITT G.723 3 or 5bit ADPCM format data
GAL	Corel Multimedia Manager album
GCD	Generic (TM) CADD drawing (later versions)
GCP	Ground Control Point file used in image processing of remote sensing data often to form map projections. CHIPS (CopenHagen Image Processing System) uses these files.
GDB	InterBase database file
GDM	Bells, whistles, and sound boards module format
GED	GEDCOM genealogical data file, a popular format for recording and exchanging genealogical data
GED	Graphic Environment Document (drawing)
GEM	GEM metafile
GEN	Ventura-Generated text file
GetRight	GetRight Unfinished-Download 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
GKH	Ensoniq EPS family disk image file
GKS	Gravis GripKey document
GL	An animation format
GNA	Genigraphics Graphics Link presentation
GNT	Generated Code, an executable code in a Micro Focus proprietary format
GNX	Genigraphics Graphics Link presentation
GRA	Microsoft Graph
GRD	Grid file, used in image processing of remote sensing data often to form map projections. CHIPS (CopenHagen Image Processing System) uses these files
GRF	Grapher (Golden Software) graph file
GRP	Program Manager Group
GSM	Raw GSM 6.10 audio stream
GSM	Raw 'byte aligned' GSM 6.10 audio stream
GSM	US Robotics voice modums GSM w.o. header/VoiceGuide/RapidComm
GSM	US Robotics voice modums GSM w. header/QuickLink
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
Return to Top

H

H	C program header
HCOM	Sound Tools HCOM format
HDF	A file in Hierarchical Data Format
HED	HighEdit document
HEL	Microsoft Hellbender saved game
HEX	Macintosh BinHex 2.0 file
HGL	HP Graphics Language drawing
HH	Map file. Contains topic IDs and map numbers for each of the topics in a Help system. Allows the running application to send the user the appropriate context-sensitive help topic
HLP	Help file
HLP	DataCAD Windows 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
HTT	Microsoft Hypertext Template
HTX	Extended HTML template
HXM	Descent2 HAM file extension
Return to Top

I

ICA	Citrix file
ICB	Targa bitmap
ICC	Kodak printer format
ICL	Icon Library file (an industry standard)
ICM	Image Color Matching profile file
ICO	Windows Icon
IDB	MSDev 'intermediate' file
IDD	MIDI Instrument Definition
IDF	MIDI Instrument Definition (Windows 95 required file)
IDQ	Internet Data Query file
IDX	Microsoft FoxPro relational database index file
IDX	Symantec Q&A relational database index file
IDX	Microsoft Outlook Express file
IFF	Interchange Format Files, Amiga ILBM
IGES	Initial Graphics Exchange Specification file
IGF	Inset Systems metafile
IIF	QuickBooks for Windows interchange file
ILBM	A bitmap (graphic image) file
IMA	WinImage file
IMG	GEM image
INC	Assembler language or Active Server include file
INF	Information file
INI	Initialization file
INI	MWave DSP synth's mwsynth.ini GM-setup
INI	Gravis UltraSound bank setup
INP	Oracle source code for form, version 3.0 and earlier
INRS	INRS-Telecommunications audio
INS	InstallShield install script
INS	X-Internet sign-up file
INS	Ensoniq EPS family instrument
INS	Sample Cell/II MAC/PC instruments
INT	Intermediate Code, an executable code produced when a source program is syntax-checked
IOF	Findit document
IQY	Microsoft Internet Inquiry 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
IST	Digitaltracker instrument file
ISU	InstallShield uninstall script
IT	Impulse Tracker music module (MOD) file
ITI	Impulse Tracker instrument
ITS	Impulse Tracker sample
ITS	Internet document set (possibly a Microsoft file)
IV	A file format use in Open Inventor
IW	Idlewild screensaver
Return to Top

J

J62	Ricoh camera format
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 file
JIF	JPEG file
JFIF	JPEG file
JMP	SAS JMPDiscovery chart-to-statistics file
JN1	Epic MegaGames Jill of the Jungle data file
JPE	JPEG File
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
Return to Top

K

L

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
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
Return to Top

M

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	A file format which repesents a scene in KINETIX's 3D Studio MAX
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
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
MGF	A file in a Materials and Geometry Format
MHTM	MHTML document (MIME)
MHTML	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.
MIME	See MIM.
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
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
MNX	Microsoft FoxPro menus
MOD	FastTracker, StarTrekker, Noise Tracker (etc.) 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
MRI	MRI Scan
MSA	Magic Shadow Archive
MSDL	Manchesters Scene Description Language
MSG	Microsoft Mail message
MSN	Microsoft Network document
MSN	Descent Mission File
MSP	Microsoft Paint bitmap
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
Return to Top

N

NAN	Nanoscope files (Raw Grayscale)
NAP	NAP Metafile	Vector image
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
NIL	Norton Icon Library file (EasyIcons-compatible)
NIST	NIST Sphere audio
NLB	Oracle 7 data
NLM	Netware Loadable Module
NLU	Norton Live Update E-Mail Trigger file
NSF	Lotus Notes database
NS2	Lotus Notes database (version 2)
NST	Noise Tracker music module (MOD) file
NTF	Lotus Notes database template
NWC	Noteworthy Composer song file
NWS	Microsoft OutlookExpress news message (MIME RFC822)
Return to Top

O

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
OPX	OPL extension DLL
ORC	Oracle 7 script
ORG	Lotus Organiser file
OR2	Lotus Organiser 2 file
OR3	Lotus Organiser 97 file
ORA	Oracle 7 configuration
OSS	Microsoft Office Search file
OST	Microsoft Exchange/Outlook Offline file
OTL	Super NoteTab template file (Fookes)
Return to Top

P

Q

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
QFL	FAMILY LAWYER document
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
Return to Top

R

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
RES	Microsoft Visual C++ Resource
RGB, SGI	Silicon Graphics RGB files
RFT	Revisable Form Text (part of IBM's DCA or Document Content Architecture)
RLE	Run-Length Encoded bitmap
RL2	Descent2 Registered Level
RM	Real Audio video file
RMD	Microsoft RegMaid document
RMF	Rich Map Format (used by 3-D game editors to store a map)
RMI	MIDI music
ROV	Rescue Rover data file
RPM	RedHat Package Manager package (for Linux)
RPT	Microsoft Visual Basic Crystal Reports file
RRS	save file for the ace game Road Rash
RSL	Borderland's Paradox 7 reports
RTF	Rich Text Format document
RTM	Real Tracker music module (MOD) file
RTK	Used by RoboHELP to simulate the search feature of Windows help
RTS	RealAudio's RTSL document
RTS	RoboHELP to speed complex operations
RUL	Extension used in InstallShield
RVP	Microsoft Scan Configuration file (MIME)
RXX	RAR compressed files from a multi-volume archive (xx = a number from 01 to 99)
Return to Top

S

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)
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
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
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)
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	Sceensaver exetension
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
Return to Top

T

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
Return to Top

U

V

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
VRML	A VRML file
VSD	Visio drawing (flow chart or schematic)
VSL	Download List file (GetRight)
VSS	Visio Stencil file
VST	Targa bitmap
VSW	Visio Workspace file
VXD	Microsoft Windows virtual device driver
Return to Top

W

WAB	Microsoft Outlook file
WAD	Large file for Doom game containing video, player level, and other information
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
WEB	CorelXara Web document
WFB	Turtle Beach WaveFront Bank (Maui/Rio/Monterey)
WFD	Turtle Beach WaveFront Drum set (Maui/Rio/Monterey)
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
WLD	REND386/AVRIL file
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
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
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
Return to Top

X

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
Return to Top

Y

YAL	Arts & Letters clipart library
YBK	Microsoft Encarta Yearbook

Z

Z	Unix Gzip	Compressed
ZIP	Zip file	Compressed archive
ZOO	An early compressed file format

Numbers and symbols

000-999	Used to number old (backup) versions of files (for example, CONFIG.SYS when changed by an installation program); also used to number related data files for multiple users of a small- scale PC application
12M	Lotus 123 97 Smartmaster file
123	Lotus 123 97 file
2GR and 3GR	VGA Graphics driver/configuration files under Windows
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 and higher	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

Return to Top