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Data Resources

File Extensions Reference

# | 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

 

#

.$$$
Temporary file
.$$A
OS/2 program file
.$$F
OS/2 database file
.$$S
OS/2 spreadsheet file
.$D$
OS/2 planner file
.$DB
DBASE IV temporary file
.$ED
Microsoft C temporary editor file.
.$VM
Microsoft Windows temporary file for virtual managers.
._DD
Norton disk doctor recovery file.
._DM
Nuts n Bolts disk minder recovery file.
.---
File used to backup sys, ini, dat, and other important files from Windows 3.1 and above.
.075
Ventura Publisher 75x75 dpi screen characters
.085
Ventura Publisher 85x85 dpi screen characters
.091
Ventura Publisher 91x91 dpi screen characters
.096
Ventura Publisher 96x96 dpi screen characters
.0B
Pagemaker printer font LineDraw enhanced characters.
.1ST
File used by some software manufacturers to represent a file that should be read first before starting the program.
.2GR
File used in Windows 3.x to display the graphics on older 286 and 386 computers.
.386
Virtual machine support files for the 386 enhanced mode.
.3GR
File used in Windows 3.x to display the graphics on later 386, 486 and Pentium computers.
.4SW
4DOS Swap file
 

A

.A
ADA program file or UNIX library
.A3W
MacroMedia Authorware 3.5 file
.ABK
Autobackup file used with Corel Draw 6 and above.
.ABR
Brush file for Adobe Photoshop
.ACE
WinAce compressed file.
.ACT
Adobe Photoshop Color table file.
.AD
.ADF
Adapter description files.
.ADM
After Dark screen saver module.
.ADR
After Dark randomizer or Opera browser bookmark backup.
.AI
Adobe Illustrator file.
.AIF
Auto Interchange File Format (AIFF) Audio file.
.ANI
Windows 95 / Windows 98 / Windows NT animated mouse cursor file.
.ANS
ANSI text file.
.ARC
Short for archive, .ARC is a compressed file extracted and used with various compression utilities.
.ARJ
Compressed file extracted used with various compression utilities.
.AS
Short for AppleSingle, .AS is a compressed file extracted and used with various compression utilities.
.ASC
ASCII Text file
.ASF
Sort for Advanced Streaming Format, file developed by Microsoft. The .ASF file is generally a movie player and can be open with software such as Windows Media Player.
.ASP
Microsoft FrontPage Active Server Pages. To open these files use your internet browser.
.ATO
Compaq Just Burn File.
.AVI
Microsoft Windows Movie file.
.AXX
AxCrypt encrypted file.
 

B

.B64
Short for BASE64, .B64 is a compressed file extracted and used with various compression utilities.
.BAK
Backup file used for important windows files usually used with the System.ini and the Win.ini.
.BAS
QBasic program and or Visual Basic Module.
.BAT
Batch file that can perform tasks for you in dos, like a macro.
.BFC
Microsoft Windows 95 / Windows 98 Briefcase file.
.BG
Backgammon game file.
.BIN
Translation tables for code pages other than the standard 437.
.BK2
Corel Word Perfect for Windows Backup file.
.BK3
Corel Word Perfect for Windows Backup file.
.BK4
Corel Word Perfect for Windows Backup file.
.BK5
Corel Word Perfect for Windows Backup file.
.BK6
Corel Word Perfect for Windows Backup file.
.BK7
Corel Word Perfect for Windows Backup file.
.BK8
Corel Word Perfect for Windows Backup file.
.BK9
Corel Word Perfect for Windows Backup file.
.BMP
Graphical Bit Mapped File used in Windows Paintbrush.
.BNK
Sim City Backup
.BPS
Microsoft Works Word Processor File.
.BPT
Corel  Draw Bitmap master file.
.BTOA
Compressed file extracted and used with various compression utilities.
.BV1
Corel Word Perfect for Windows Backup file.
.BV2
Corel Word Perfect for Windows Backup file.
.BV3
Corel Word Perfect for Windows Backup file.
.BV4
Corel Word Perfect for Windows Backup file.
.BV5
Corel Word Perfect for Windows Backup file.
.BV6
Corel Word Perfect for Windows Backup file.
.BV7
Corel Word Perfect for Windows Backup file.
.BV8
Corel Word Perfect for Windows Backup file.
.BV9
Corel Word Perfect for Windows Backup file.
.BWP
BatteryWatch pro file.
.BZ
Compressed file extracted and used with bzip and bunzip various compression utilities.
.BZ2
Compressed file extracted and used with bzip2 and bunzip and various other compression utilities. 
 

C

.C
C file used with the C programming language.
.CAB
Cabinet file used in Windows 95 and Windows 98 that contains all the windows files and drivers. Information about how to extract a .CAB file can be found on document CH000363.
.CAL
Windows Calendar, Supercalculator4 file or Supercal spreadsheet.
.CBL
COBOL Program File
.CBT
Computer Based Training files.
.CDA
CD Audio Player Track.
.CDR
Corel Draw Vector file.
.CFB
Comptons Multimedia file
.CFG
Configuration file
.CFL
Corel flowchart file
.CFM
Corel FontMaster file / Cold Fusion Template file / Visual dBASE windows customer form
.CHK
Scandisk file which is used to back up information that scandisk has found to be bad, found in C root. Because the information within these files are corrupted or reported as bad by Scandisk it is perfectly fine to delete these files, providing you are currently not missing any information. Additional information about scandisk can be found on our scandisk page.
.CL
Generic LISP source code.
.CL3
Easy CD Creator layout file.
.CL4
Easy CD Creator layout file.
.CLA
Java Class file.
.CLG
Disk catalog database
.CLK
Corel R.A.V.E. animation file.
.CLL
Crick software clicker file
.CLO
Cloe image
.CLP
Windows Clipboard / Quattro Pro clip art / Clipper 5 compiler script
.CLR
WinEdit Colorization word list / 1st reader binary color screen image / PhotStyler color definition
.CLS
Visual Basic Class module /  C++ Class definition
.CMD
Windows Script File also OS/2 command file.
.CMV
Corel Movie file.
.CNT
Help file (.hlp) Contents (and other file contents)
.CPL
Windows 95 / Windows 98 / Windows NT control panel icons.
.CNE
Configuration file that builds .COM files.
.CNF
Configuration file.
.COB
COBOL source code file.
.COD
FORTRAN Compiler program code
.COM
File that can be executed.
.CPE
Fax cover page file
.CPI
Code Page Information or Microsoft Windows applet control panel file
.CPP
C++ source code file.
.CPT
Compact Pro compressed file extracted and used with various compression utilities.
.CRD
Windows Card file.
.CSV
Comma-Separated Variable file. Used primary with databases and spreadsheets / Image file used with CopuShow
.CUR
Windows Mouse Cursor.
.CVS
Canvas drawing file
.CXX
C++ program file or Zortech C++ file
 

D

.D
A D programming language source file.
.DAT
Data file, generally associated or extra data for a program to use. 
.DB
Paradox database file / Progress database file
.DB2
dBase II file
.DBC
Microsoft Visiual Foxpro database container
.DBF
dBase II,III,III+,IV / LotusWorks database.
.DBK
dBase databse backup / Orcad schematic capture backup file
.DBM
Cold Fusion template
.DBO
dBase IV compiled program file
.DBQ
Paradox memo
.DBT
dBase database text file
.DBV
Flexfile memo field file
.DBW
DataBoss database file
.DBX
Database file / DataBeam Image / MS Visual Foxpro Table
.DEV
Device Driver
.DIF
Document Interchange Format; VisiCalc
.DLL
Dynamic Link Library; Allow executable code modules to be loaded on demand, linked at run time, and unloaded when not needed. Windows uses these files to support foreign languages and international/nonstandard keyboards.
.DMO
Demo file
.DMP
Dump file
.DMD
Visual dBASE data module
.DMF
Delusion/XTracker Digital Music File
.DMO
Demo file
.DMP
Dump file
.DMS
Compressed archive file
.DOC
Microsoft Word Windows/DOS / LotusWorks word processor Windows/DOS /PF S:First Choice Windows/DOS DOT MS Word Windows/DOS.
.DOS
Text file and DOS Specification Info
.DOT
Microsoft Word Template (Macro).
.DRV
Device driver files that attach the hardware to Windows. The different drivers are system, keyboard, pointing devices, sound, printer/ plotter, network, communications adapter.
.DRW
Micrografx draw/graph files.
.DT_
Macintosh Data File Fork
.DTA
Data file
.DTD
SGML Document definition file
.DTF
Q&A database
.DTM
DigiRekker module
.DTP
SecurDesk! Desktop / Timeworks Publisher Text Document / Pressworks Template file
.DUN
Dialup Networking exported file.
.DX
Document Imaging file / Digital data exchange file
.DXB
Drawing interchange binary file
.DXF
Autocad drawing interchange format file
.DXN
Fujitsu dexNet fax document
.DXR
Macromedia director projected movie file
.DYN
Lotus 1-2-3 file.
.DWF
Short for Design Web Format, DWF is a Autodesk file used to store formatted text on the Internet.
.DWG
AutoCad Drawing Database
 

E

.EEB
Button bar for Equation Editor in Word Perfect for Windows
.EFT
CHIWRITER high resolution screen characters
.EGA
EGA screen characters for Ventura Publisher
.ELG
Event List text file used with Prosa
.EMS
Enhanced Menu System configuration file for PC Tools
.EMU
IRMA Workstation for Windows emulation
.ENC
ADW Knowledge Ware Encyclopedia
.END
Corel Draw Arrow Definition file
.ENG
Sprint dictionary file engine
.ENV
Word Perfect for Windows environment file.
.EPG
Exported PaGe file used with DynaVox 
.EPS
Encapsulated Postscript, with embedded TIFF preview images.
.EQN
Word Perfect for Windows Equation file
.ERD
Entity Relation Diagram graphic file
.ERM
Entity Relation Diagram model file
.ERR
Error log file
.ESH
Extended Shell Batch file
.EVT
Event file scheduler file for PC Tools
.EX3
Device driver for Harvard graphics 3.0
.EXC
QEMM exclude file from optimization file or Rexx program file
.EXD
Control information cache for Microsoft office document files. 
.EXE
Executable file.
.EXT
Extension file for Norton Commander
 

F

.FCP
FLAMES Checkpoint Restart file (Ternion Corporation)
.FDF
Adobe Acrobat Forms Document.
.FF
AGFA CompuGraphics outline font description.
.FFA
Microsoft Fast Find file.
.FFF
GUS PnP bank / defFax fax document
.FFL
Microsoft Fast Find file / PrintMaster Gold form file
.FFO
Microsoft Fast Find file
.FFT
DCA/FFT final form text
.FFX
Microsoft Fast Find file
.FON
Font files to support display and output devices.
.FPB
FLAMES Playback file (Ternion Corporation)
.FPR
FLAMES Prototype file (Ternion Corporation)
.FQY
FLAMES FLARE Command file (Ternion Corporation)
.FR3
dBase IV renamed dBase III+ form
.FRC
FLAMES RECORD Output file; FLARE Input file (Ternion Corporation)
.FRF
FontMonger Font
.FRG
dBase IV uncompiled report
.FRK
Compressed zip file used with Apple Macintosh computers.
.FRM
Form file used with various programs / Microsoft Visual Basic Form / FrameMaker document / FrameBuilder file / Oracle executable form / Word Perfect Merge form / DataCAD symbol report file
.FRO
dBase IV compiled report / FormFlow file
.FRP
PerForm Pro Plus Form
.FRS
WordPerfect graphics driver
.FRT
FoxPro report file
.FRX
Microsoft Visual basic binary form file / FoxPro report file
.FRZ
FormFlow file
.FSC
FLAMES Scenario file (Ternion Corporation)
 

G

.GIF
CompuServe Graphics Interchange Format.
.GR2
286 grabbers that specify which font to use with DOS and Windows.
.GR3
386 grabbers that specify which font to use with DOS and Windows.
.GRA
Microsoft Flight simulator graphics file
.GRB
Microsoft MS-DOS shell monitor
.GRF
Micrografx draw/graph files.
.GRP
Microsoft Program Group.
.GZ
Compressed file extracted and used with gzip and gunzip various compression utilities.
 

H

.HBK
Mathcad handbook file
.HDL
Procomm Plus alternate download file listing
.HDR
Procomm Plus message header
.HDX
Help index
.HEX
Hex dump
.HFI
GEM HP font info
.HGL
HP graphics language graphic
.HH
C++ Header
.HHH
Precompiled Header for Power C
.HHP
Help data for Procomm Plus
.HLP
Files that contain the Help feature used in windows, cannot be read from DOS.
.HQX
Apple Macintosh Binhex text conversion file. Compressed file extracted and used with various compression utilities.
.HSQ
Data files associated with the Qaz Trojan.
.HSS
Photoshop Hue/Saturation information.
.HST
History file / Procomm Plus History File / Host file.
.HTA
Hypertext Application (run applications from HTML document).
.HTM
Web page files containing HTML or other information found on the Internet.
.HTML
Web page files containing HTML or other information found on the Internet.
 

I

.ICA
Citrix file / IOCA graphics file
.ICB
Targa Bitmap
.ICC
Kodak printer image
.ICE
Archive file
.ICL
Icon library file
.ICM
Image Color Matching profile file
.ICN
Microsoft Windows Icon Manager.
.ICO
Microsoft Windows Icondraw / Icon.
.ID
Disk identification file.
.IDB
Microsoft developer intermediate file, used with Microsoft Visual Studio
.IDD
MIDI instruments definition
.IDE
Integrated Development Environment configuration file
.IDF
MIDI instruments drivers file
.IDQ
Internet data query file
.IDX
Index file
.IFF
IFF/LBM (Amiga) used by Computer Eyes frame grabber.
.IMG
GEM/IMG (Digital Research) or Ventura Publisher bitmap graphic
.INF
Information file that contains customization options.
.INI
Files that initialize Windows and Windows apps.
.IPF
Installer Script File / OS/2 online documentation for Microsoft source files.
.ISO
Compressed file used for an exact duplicate of a CD. .ISO files can be extracted or opened such programs as Win Image that can be found on our shareware download section. Also see our ISO image dictionary definition.
.IWA
IBM Writing Assistant Text file.
 

J

.JAS
Graphic
.JPG
Graphic commonly used on the Internet and capable of being opened by most modern image editors.
.JS
JavaScript file.
.JSB
Henter-Joyce Jaws script binary file
.JSD
eFAX jet suite document
.JSE
JScript encoded script file
.JSH
Henter-Joyce Jaws script header file
.JSL
PaintShop pro file
.JSM
Henter-Joyce Jaws script message file
.JSP
Java server page
.JSS
Henter-Joyce Jaws script source file
.JT
JT fax file
.JTF
JPEG tagged Interchange format file 
.JTK
Sun Java toolkit file
.JTP
JetForm file
.JW
Justwrite text file
.JWL
Justwrite text file library
.JZZ
Jazz spreadsheet
 

K

.KAR
Karaoke File used with some audio players.
.KDC
Kodak Photo-Enhancer file.
.KFX
KoFaX image file.
.KYE
Kye game data file.
 

L

.LGC
Program Use Log File (for Windows Program Use Optimization).
.LGO
Contains the code for displaying the screen logo.
.LHA
Compressed file extracted and used with various compression utilities.
.LIB
Program library file.
.LOG
Contains the process of certain steps, such as when running scandisk it will usually keep a scandisk.log of what occurred.
.LNK
Windows shortcut or a HTML link file used with Microsoft Internet Explorer.
.LWP
Lotus Wordpro 96/97 file.
.LZH
Compressed file extracted and used with various compression utilities.
 

M

.MAC
Macintosh macpaint files.
.MBX
.MD
Compressed Archive file
.MDA
Microsoft Access Add-in / Microsoft Access 2 Workgroup.
.MDB
Microsoft Access Database / Microsoft Access  Application.
.MDE
Microsoft Access Database File
.MDF
Menu definition file
.MDL
Digitrakker Music Module / Rational Rose / Quake model file
.MDM
Telix Modem Definition
.MDN
Microsoft Access Blank Database Template
.MDP
Microsoft Developer Studio Project
.MDT
Microsoft Access Add-in Data
.MDW
Microsoft Access Workgroup Information
.MDX
dBase IV Multiple Index
.MDZ
Microsoft Access Wizard Template
.MEB
WordPerfect Macro Editor bottom overflow file
.MED
WordPerfect Macro Editor delete save / OctaMed tracker module
.MEM
WordPerfect Macro Editor macro / Memory File of variables
.MID
Midi orchestra files that are used to play with midi sounds built within the sound card.
.MIM
MIME compressed file extracted and used with various compression utilities.
.MIX
Power C object file / Multiplayer Picture file (Microsoft Photodraw 2000 & Microsoft Picture It!) / Command & Conquer Movie/Sound file
.MKV
Short for Matroska, .MKV is similar to a .OGM file and is open source cross-platform movie file.
.MME
Compressed file extracted and used with various compression utilities.
.MOD
Winoldap files that support (with grabbers) data exchange between DOS apps and Windows apps.
.MOV
File used with Quick Time to display a move.
.MP1
MPEG audio stream, layer I
.MP2
MPEG audio stream, layer II
.MP3
MPEG audio stream, layer III;  High compressed audio files generally used to record audio tracks and store them in a decent sized file available for playback. See our MP3 page for additional information.
.MPP
Microsoft Project file.
.MPG
MPEG movie file.
.MSN
Microsoft Network document / Decent mission file.
.MSP
Microsoft paint file format.
.MTF
Windows metafile.
.MTH
Derive Math file
.MTM
Sound file / MultiTracker music module
.MTV
Picture file
.MTW
Minitab data file
.MU
Quattro menu
.MUL
Ultima Online game
.MUP
Music publisher file
.MUS
Audio file
.MVB
Database file / Microsoft multimedia viewer file
.MVE
Interplay video file
.MVF
Movie stop frame file
.MWP
Lotus Wordpro 97 smartmaster file
.MXD
ArcInfo map file
.MXT
Microsoft C Datafile
.MYD
Make your point presentation file.
 

N

.N64
Nintendo 64 Emulator ROM image.
.NA2
Netscape Communicator address book.
.NAB
Novell Groupwise address book
.NAP
Napster Music security definition file.
.NDF
NeoPlanet Browser file
.NDX
Indexed file for most databases.
.NES
Nintendo Entertainment system ROM image.
.NIL
Norton guide online documentation
.NGF
Enterasys Networks NetSight file.
.NHF
Nero HFS-CD compilation or  a general Nero file
.NIL
Norton icon lybrary file.
.NLB
Oracle 7 data file
.NLD
ATI Radeon video driver file,
.NMI
SwordSearcher file.
.NON
LucasArts Star Wars - Tie fighter mouse options file.
.NOW
Extension commonly used for readme text files.
.NRA
Nero Audio CD file.
.NRB
Nero CD-ROM boot file.
.NS2
Lotus Notes 2 database,
.NS5
Lotus Notes Domino file,
.NSO
NetStudio easy web graphics file.
.NT
Windows NT startup file.
.NUM
File used with some Software Manufactures to store technical support numbers or other phone numbers, should be readable from DOS and or Windows.
 

O

.OCA
Control Typelib Cache.
.OCX
Object Linking and Embedding (OLE) control extension.
.OGM
A Ogg Media File, OGM files are movie files.
.OLB
Object library
.OLD
Used for backups of important files incase they are improperly updated or deleted.
.OLE
Object Linking and Embedding object file
.OLI
Olivetti text file
.ORI
Original file.
 

P

.PAB
Personal Address Book, file used with Microsoft Outlook.
.PAK
Compressed file extracted and used with various compression utilities. Often many games will have large .PAK files that contain a lot of the games information.
.PB
WinFax Pro phone book file
.PBD
PowerBuilder dynamic library / Faxit phone book file
.PBF
Turtle Beach Pinnacle bank file
.PBK
Microsoft phonebook file
.PBL
PowerBuilder library file
.PBM
UNIX portable bitmap fuke
.PBR
PowerBuilder resource
.PBI
Profiler binary input file
.PBM
PBM portable bit map graphic
.PBO
Profiler binary output
.PBT
Profiler binary table
.PCX
Microsoft Paint & PC Paintbrush Windows/DOS.
.PDA
Bitmap graphic file
.PDB
TACT data file
.PDD
Adobe PhotoDeluxe Image.
.PDF
.PDL
Borland C++ project description language file.
.PDS
Graphic file / Pldasm source code file.
.PDV
Paintbrush printer driver.
.PDW
Professional Draw document.
.PF
Short for Private File, .PF is a compressed file extracted and used with various compression utilities.
.PIC
Picture / Viewer Frame Class.
.PIF
Program Information File that configures a DOS app to run efficiently in windows.
.PJF
Paintjet soft font file.
.PKG
Apple Newton File, MicroSim PCBoard External ASCII file, Microsoft Developer Studio Application File,  Next installer script
.PL
Harvard palette file or PERL program file.
.PL3
Harvard chart palette
.PLB
Foxpro library / LogoShow Screensaver file
.PLC
Lotus Add-in
.PLD
PLD2 source file
.PLG
REND386 / AVRIL file
.PLI
Oracle 7 data description
.PLL
Prelinked library
.PLM
DisorderTracker2 module
.PLN
WordPerfect spreadsheet file
.PLR
Descent Pilot file
.PLS
WinAmp MPEG playlist file / DisorderTracker 2 Sample file / Shoutcast file / MYOB data file
.PLT
AutoCAD HPGL vector graphic plotter file / Gerber sign-making software file / Betley's CAD Microstation driver configuration for plotting
.PLY
Autodesk polygon
.PP
Compressed archive file.
.PP4
Picture Publisher.
.PP5
Picture Publisher.
.PPA
Power Point Add-in.
.PPB
WordPerfect Print preview button bar.
.PPD
PostScript Printer description.
.PPF
Turtle Beach Pinnacle program file.
.PPI
Microsoft PowerPoint graphic file.
.PPL
Harvard (now Serif) Polaroid Palette Plus ColorKey Driver.
.PPM
PBM Portable Pixelmap Graphic.
.PPO
Clipper Preprocessor Output.
.PPP
Serif PagePlus Publication.
.PPS
Microsoft PowerPoint Slideshow.
.PPT
Microsoft PowerPoint presentation.
.PPX
Serif PagePlus publication.
.PPZ
Microsoft PowerPoint Packaged Presentation.
.PS2
File to support the Micro Channel Architecture in 386 Enhanced mode.
.PSD
Adobe Photoshop image file.
.PST
Post Office Box file used with Microsoft Outlook usually mailbox.pst unless named otherwise.
.PWA
Password agent file.
.PWD
Password file.
.PWF
ProCite Workforms
.PWL
Password file used in Windows 95 and Windows 98 is stored in the Windows directory.
.PWP
Photoworks image file.
.PWZ
PowerPoint wizard.
.PX
Paradox primary database index file.
.PXL
Pocket Excel worksheet file.
.PY
Python script file.
.PYC
Compiled Python script file.
.PYD
Python binary extension for Windows.
.PYW
Python GUI script for Windows.
.PZ2
Curious Labs Poser pose file.
.PZ3
Curious Labs Poser document.
.PZA
MGI PhotoSuite album file.
.PZD
Pizazz Plus default settings file.
.PZL
Puzzle file or Load Runner game puzzle file.
.PZO
Pizazz Plus overlay file.
.PZP
MGI PhotoSuite project file.
.PZS
Pizazz Plus settings file.
.PZT
Pizazz Plus transfer file.
.PZX
Pizazz Plus swap file.
 

Q

.QIC
Windows backup file 
.QT
Quick Time Movie File
.QXD
Quark Express file
.QXL
Quark Xpress element library
.QXT
Quark Xpress template file
 

R

.RA
Real Audio file.
.RAM
Real Audio file.
.RAR
Compressed file similar to .ZIP uses different compression program to extract. See our recommended download page for a program that can be used to extract .RAR files.
.RAS
File extension used for raster graphic files.
.RD1
Descent registered level file
.RD3
Ray Dream designer graphics file / CorelDraw 3D file
.RD4
Ray Dream designer graphics file
.RD5
Ray Dream designer graphics file
.RDB
TrueVector rules database
.RDF
Resource description framework file / Chromeleon report definition
.RDL
Descent registered level file / RadioDestiny radio stream
.RDX
Reflex data file
.REC
Sound file used with Windows Sound Recorder.
.RLE
Run Length Encoded file. See RLE definition for additional information.
.RMI
Microsoft RMID sound file.
.RPB
Automotive diagnostic file.
.RPD
Rapidfile database
.RPM
Red Hat Package Manager / RealMedia Player file.
.RPT
Various Report file
.RTF
Rich Text Format file. See our RTF dictionary definition for additional information.
.RWZ
Microsoft Outlook rules wizard file
 

S

.SAV
File that usually contains saved information such as a saved game.
.SC2
Maps used in Sim City 2000.
.SCP
Dialup Networking script file.
.SCR
Source files for the .INI files, or sometimes may be used as screen savers.
.SD
Sound Designer I audio file
.SD2
Sound Designer II flattened file / Sound Designer II data fork file / SAS database file
.SDA
StarOffice drawing file / SoftCuisine data archive
.SDC
StarOffice spreadsheet
.SDD
StarOffice presentation
.SDF
Standard data format file / Schedule data file / System file format / Autodesk mapguide spatial data file
.SDK
Roland S-series floppy disk image
.SDL
SmartDraw library
.SDN
Small archive
.SDR
SmartDraw drawing
.SDS
StarOffice chart file / Raw MIDI sample dump standard file 
.SDT
SmartDraw template
.SDV
Semicolon divided value file
.SDW
Sun Microsystems StarOffice file document file similar to the Microsoft Office .DOC file.
.SDX
MIDI sample dump standard files compacted by SDX
.SEA
Compressed file often used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities.
.SH
Archive file
.SH3
Harvard (now Serif) presentation file
.SHB
Corel Background file
.SHG
Hotspot Editor Hypergraphic
.SHK
Apple Macintosh Compressed Archive file
.SHM
WordPerfect Shell Macro
.SHP
3D Studio Shapes File / other 3D related file
.SHR
Archive file
.SHS
Shell scrap object file
.SHTML
.SHW
Corel presentation / WordPerfect Slide Show / Show File.
.SIT
A compressed file often used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities.
.SITX
A compressed file often used with Apple Macintosh computers and Stuffit that is extracted and used with various compression utilities.
.SLK
Multiplan file. / Microsoft Excel symbolic link.
.SND
Sound Clip file / Raw unsigned PCM data / AKAI MPC-series sample / NeXT sound / Macintosh sound resource file
.SNG
MIDI song
.SNM
Netscape Mail
.SNO
SNOBOL program file
.SNP
Snapview snapshot file
.SUM
Summary file.
.SWF
Macromedia Flash file.
.SWP
Extension used for the Windows Swap File usually Win386.Swp. This file is required by Windows and generally can grow very large in size sometimes up to several hundred megs. This file is used to swap information between currently running programs and or memory. If this file is deleted from the computer Windows will be unable to load and will need to be reinstalled.
.SYS
System and peripheral drivers.
 

T

.TAR
Short for Tape ARchive, TAR files are a single file that usually contains multiple files. They are not compressed files, and are often used to group a collection of files. Additional information about TAR files can be found on our Linux / UNIX tar command page.
.TAR.GZ
A compressed file including the TAR compressed with gzip. See above .TAR explanation.
.TBZ
A compressed file including the TAR compressed with bzip. See above .TAR explanation.
.TBZ2
A compressed file including the TAR compressed with bzip2. See above .TAR explanation.
.TDF
Trace Definition File used with OS/2.
.TGA
Targa file.
.TGZ
A compressed file including the TAR compressed with gzip. See above .TAR explanation.
.TIF
Tag Image Format that includes most 24-bit color.
.TLB
Remote automation truelib files / OLE type library / Visual C++ type library.
.TLD
Tellix file.
.TLE
NASA two-line element set.
.TLP
Microsoft project timeline fie.
.TLT
Trellix web design file.
.TLX
Trellix data file.
.TMP
Temporary files. Additional information about removing temporary files can be found on document CH000225.
.TRM
Windows Terminal.
.TXT
Text file that can be read from windows of from DOS by using the Edit, Type, or Edlin.
 

U

.UNI
MikMod (UniMod) format file / Forcast Pro data file
.UNK
Unknown file type, sometimes used when a file is received that cannot be identified
.UNX
Text file generally associated with UNIX.
.URL
File used with some browsers such as Internet Explorer linking you to different web pages. Internet Shortcut.
.UU
A uucode compressed file that is extracted and used with various compression utilities.
.UUE
A uucode compressed file that is extracted and used with various compression utilities.
 

V

.VB
VBScript file
.VBA
vBase file
.VBD
ActiveX file
.VBE
VBScript encoded script file
.VBG
Visual Basic group project file
.VBK
VisualCADD backup file
.VBL
User license control file 
.VBP
Visual Basic project file
.VBR
Remote automation registration files
.VBS
Microsoft Visual Basic Script file for quick programs and in some cases can be used as a virus file.
.VBW
Visual Basic project workplace
.VBX
Visual Basic extension file
.VBZ
Wizard launch file 
.VC
VisiCalc Spreadsheet file.
.VCD
VisualCADD Drawing file.
.VCE
Natural MicroSystems voice file.
.VCF
vCard File / Vevi Configuration file.
.VCS
Microsoft Outlook vCalander file.
.VCT
FoxPro class library.
.VCW
Microsoft Visual C++ workbench information file.
.VCX
FoxPro class library.
.VDA
Targa bitmap
.VDD
Short for Virtual Device Driver. Additional information can be found here.
.VDO
VDOScript file
.VDX
No such file extension - Likely you meant to .vxd 
.VM
Virtual Machine / Virtual Memory file.
.VMM
Virtual Machine (Memory Manager) file.
.VMF
Ventura font characteristics file / FaxWorks audio file
.VMH
.VS2
Roland-Bass transfer file.
.VSD
Visio drawing.
.VSL
GetRight download list file.
.VSS
Visio stencil.
.VST
Video Template / Truevision Vista graphic / Targa Bitmap/
.VSW
Visio workspace file.
.VXD
Windows system driver file allowing a driver direct access to the Windows Kernel, allowing for low level access to hardware.
 

W

.WAB
Microsoft Outlook Express personal address book.
.WAD
File first found in IdSoftware games such as DOOM, Quake, as well as most new games similar to these.
.WAV
Sound files in Windows open and played with sound recorder.
.WB1
Quattro Pro Notebook 
.WB2
Quattro Pro Spreadsheet
.WBF
Microsoft Windows Batch File 
.WBK
Wordperfect document / workbook
.WBT
Winbatch batch file
.WCD
Wordperfect macro token list
.WCM
Microsoft Works data transmission file / Wordperfect Macro
.WCP
Wordperfect product information description
.WDB
Microsoft Works database
.WEB
Web source code file
.WFM
dBASE Form object
.WFN
CorelDRAW font
.WFX
Winfax data file
.WG1
Lotus 1-2-3 worksheet
.WG2
Lotus 1-2-3 for OS/2 worksheet
.WID
Ventura publisher width table
.WIN
Foxpro - dBASE window file
.WIZ
Microsoft Publisher page wizard
.WK1
Lotus 1-2-3 all versions / LotusWorks spreadsheet.
.WK3
Lotus 1-2-3 for Windows /Lotus 1-2-3 Rel.3.
.WKS
Lotus 1-2-3 Rel lA,2.0,2.01, also file used with Microsoft Works.
.WLG
Dr. Watson log file.
.WMA
Windows Media Audio file.
.WMF
Windows Metafile. Also see WMF dictionary definition.
.WMV
Windows Media Video file, these are video files often played through the Microsoft Windows Media player or compatible players. 
.WMZ
Windows Media Player theme package file.
.WPD
WordPerfect Windows/DOS.
.WPG
WordPerfect Graphical files Windows/DOS.
.WPM
WordPerfect Macro file.
.WPS
MS Works word processor Windows/DOS.
.WRI
Windows Write.
.WRK
Lotus 1-2 31.0,1.01,1.1/ Symphony 1,1.01.
.WRI
Symphony l.1,1.2,2 / Microsoft Write file.
 

X

.XIF
Wang image file / Xerox image file
.XLB
Microsoft Excel File.
.XLS
Microsoft Excel File.
.XM
Sound file / Fast tracker 2 extended module
.XML
Extensible markup language file.
.XNK
Exchange shortcut
.XOT
Xnetech job output file
.XPM
X picsmap graphic
.XQT
SuperCalc macro sheet
.XRF
Cross Reference
.XR1
Epic MegaGames Xargon File
.XSL
XML Style sheet
.XSM
LEXIS-NEXIS tracker
.XTB
LocoScript external translation table
.XWD
X Windows dump file
.XWF
Yamaha XG Works file
.XXE
Xxencoded file
.XY
XYWrite text file
.XY3
XYWrite text file
.XY4
XYwrite IV document
.XYP
XYwrite III plus document
.XYW
XYwrite Windows 4.0 document
 

Y

.Y
Amiga YABBA compressed  file archive
.Y01
Paradox index file
.Y02
Paradox index file
.Y03
Paradox index file
.Y04
Paradox index file
.Y05
Paradox index file
.Y06
Paradox index file
.Y07
Paradox index file
.Y08
Paradox index file
.Y09
Paradox index file
.YUV
Yuv graphics file
.YZ
YAC compressed file archive.
 

Z

.Z
A compressed file that is extracted and used with various compression utilities. To extract all the files Pkzip or Winzip will need to be used. UNIX / Linux users use the compress / uncompress command to extract these files.
.ZOO
A compressed file that is extracted and used with various compression utilities.
.ZIP
A compressed file that is extracted and used with various compression utilities.
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