List of filename extensions (S–Z)

This alphabetical list of filename extensions contains standard extensions associated with computer files.

Contents

• 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

• !$@
• 0–9
• See also
• References
• External links

Main article: List of filename extensions

A–E

Main article: List of filename extensions (A–E)

F–L

Main article: List of filename extensions (F–L)

M–R

Main article: List of filename extensions (M–R)

S

Ext.	Description	Used by
S$$	Temporary sort file	Sprint
S	ASSEMBLY source code file	unix
S	Multi Edit macro file source	Multi Edit
S	MSTS Shape file	MSTS
S19	Motorola ASCII format of executables
S1K	S1000 Simnet Format
S1P	Touchstone V1 Network Parameter Data (1 port)	Vector Network Analyzers
S2P	Touchstone V1 Network Parameter Data (2 port)	Vector Network Analyzers
S3P	Touchstone V1 Network Parameter Data (3 port)	Vector Network Analyzers
S4P	Touchstone V1 Network Parameter Data (4 port)	Vector Network Analyzers
S3I	Digiplayer/ST3 Sample File	Digiplayer - ST3
S3M	Music (16 channels)	Scream Tracker 3.0 - DMP
S7I	Seed7 library / include file	Seed7 interpreter and compiler
SA?	Packed mail	FTN software
SAB	Saber file	Star Wars: Jedi Knight Jedi Academy
SAF	see SAIF
SAFE	SafeIT Encrypted
SAIF	Spatial Archive Interchange Format
SAL	Datafile	SORITEC
SAN	LucasArts' SMUSH/INSANE animation
SAM	Ami Pro data file	Ami Pro
SAM	Text file	Samna - Lotus Ami/Ami Pro
SAP	Atari SAP music format
SAR	Archive	SAR
SAS	SAS Program File	SAS System
SASS	Saas stylesheet language, indented-format
SAT	ACIS ACIS .sat
SATS	Static source	ATS
SAV	Backup file (saved file)
SAV	Configuration
SAV	Executable	RT-11
SAV	SPSS "System File"	PSPP
SAV	Saved game state	Spider Solitaire (Windows)
SAVER	Screensaver	Mac OS X
SB	Audio file (signed byte)
SB	Raw Signed Byte (8bit) data	AWAVE
SB	Raw Signed PCM Byte 8bit data	AWAVE
SB	Scratch project	Scratch
SB2	Scratch 2.0 project	Scratch
SB3	Scratch 3.0 project	Scratch
SBD	Storyboard	Storyboard Editor
SBH	Header	ScriptBasic
SBI	Sound Blaster Instrument file (Creative Labs)
SBK	Emu SoundFont Bank (AWE32 Bank)	Convert (c) Villena
SBL	Stony Brook Pascal library	SB Pascal
SBP	DML program	Superbase 4
SBR	Support file	Source Browser
SBT	Notes related to record	Suberbase 4 Windows
SBX	For experimental extensions to Scratch	Used by scratchX (scratchx.org)
SBX	Sequenced Box container	Used by SeqBox
SC	Display driver	Framework II
SC	PAL script	Paradox
SC	Script	Borland Paradox
SC3	Renamed dBASE III screen mask file	dBASE IV
SC3	Screen device driver	Harvard Graphics 3.0
SC3	Saved City	SimCity 3000
SC4	Saved City	SimCity 4
SC4	Game Scenario	RollerCoaster Tycoon Deluxe/Expansion Pack
SC6	Game Scenario	RollerCoaster Tycoon 2
SCA	Datafile	SCA
SCALA	Scala source code file	Scala (programming language)
SCC	Text file
SCD	SCODOL film recorder (Scan Conversion Object Description Language)	SCODOL
SCF	Standard Chromatogram Format	DNA Baser Assembler
SCF	Standard Chromatogram Format	Staden package
SCF	?	SimAnt or SimTown ??
SCF	Windows Explorer Command (e.g.: show desktop.scf)	Windows Explorer
SCF	Multimedia show	ScoreMaker
SCF	Spelling checker configuration file	Symphony
SCH	Project schedule	Schedule Publisher
SCH	EAGLE schematic file	EAGLE (program)EAGLE
SCH	Circuit Design Schematic	P-CAD - Orcad - Protel
SchDoc	Circuit Design Schematic	Protel - Altium Designer
SCHEMATIC	MCEdit Schematic file	Unofficial MCEdit Tool for Minecraft
SCI	Fax	SciFax
SCI	System Configuration Information
SCM	Scheme source code file
SCM	Schematic file (Circuit Diagram for PCB design)	Zuken CadStar
SCM	StarCraft mission
SCN	SCeNe RTrace
SCN	Screen file	Kermit
SCO	High score
SCP	Script	BITCOM
SCPT	Script	macOS
SCPTD	Script bundle	macOS
SCR	Any other screen system
SCR	DEBUG source code file	DOS Debug
SCR	Forth screen (source) file	Forth
SCR	Screen - screen snapshot	dBASE IV - Procomm Plus
SCR	Screen font	LocoScript
SCR	Screen saver	Windows 3.x
SCR	Screen snapshop
SCR	Script file source	TeleMate - Kermit - 1st Reader
SCRIPT	Script
SCSS	Saas stylesheet language, block-formatted with braces and semicolons to denote end-of-line
SCT	Additional (FPT) screen description file	FoxPro
SCTOR	Raster graphics format used by some very obscure custom operating systems
SCX	Chart	Stanford Chart
SCX	Graphics format	ColoRIX
SCX	Main (DBF) screen description file	FoxPro
SCX	StarCraft: Brood War scenario	StarCraft: Brood War
SCY	Security file	ReaGeniX
SD	Sound Designer I audio file	AWAVE
SD7	Seed7 source file	Seed7 interpreter and compiler
SDA	Fidonet's Software Distribution Network file archive description
SDC	Video	DigimaxMaster - Samsung NV3
SDC	Synopsys Design Constraints	Electronic Design Automation Tools
SDF	Microsoft SQL Server Compact Edition database file
SDF	Flight data	microdrones GmbH
SDF	Source definition file	Sourcer
SDF	System Data Format file (fixed length ASCII text)
SDI	Software Distribution Network Info file
SDK	Roland S-550/S-50/W-30 Disk Image
SDL	Alias Wavefront Scene Description Language
SDML	Spatial Data Modeling Language
SDN	Software Distribution Network compressed file archive	pak251.exe
SDR	SmartDraw File	SmartDraw Pro
SDS	MIDI Sample DUMP Standard File
SDS	Self Defining Structure provides for N-dimensional very large datasets using HHCode	geographic information systems and relational database management systems
SDTS	Spatial Data Transfer Standard
SDW	Ami Draw Symbol File
SDX	Sample DUMP Exchange File
SEA	Self-Extracting compressed Macintosh file Archive
SEARCH	ACDSee saved search	ACDSee
SEC	compressed file
SEC	Diskreet encrypted file	Diskreet
SEC	Secret key ring file	Pretty Good Privacy RSA System
SEC	Secured animation file	Disney Animation Studio
SED	Self extraction directive file	IExpress
SEN	Scifer Archive Format (Internal Header Mode)
SEP	Printer separator page
SEQ	ABI Text Sequence	Applied Biosystems
SEQ	Atari animation file
SEQ	Video	Tiertex video sequence
SEQ	Sequential Instruction File	Bubble Chamber
SES	Session info	Clarion Modula-2
SES	Multitrack Audio Session info	Adobe Audition
SET	Configuration file	1st Reader
SET	Driver sets created by Install	Symphony
SET	Extension used by Norton Backup and CPS Backup for setup info	Norton Backup - CPS Backup
SET	Hump Assignments File	FYM
SET	Setup options file
SET	YVD card set file	YVD
SF	IRCAM Sound File	CSound package - MixView sound sample editor
SF	JAR Digital Signature
SF	WPS attribute storage (OS/2 WorkPlace Shell) wp_root.sf	OS/2 WorkPlace Shell
SF2	Emu SoundFont Bank v2.0 file	AWAVE, Viena, Polyphone, Swami
SFB	Configuration file	emacs
SFB	HP Soft font (obsolete under Windows)
SFD	SoundStage Data file	AWAVE
SFF	Standard Flowgram Format	DNA Baser SFF Workbench tool
SFF	Scene File Format
SFI	Graphics	SIS Framegrabber
SFI	Printer font (HP LaserJet landscape)	Ventura Publisher
SFL	PCL 4 bitmap font (landscape)	landscape - Intellifont - Ventura Publisher
SFL	Sound file	Sound Forge and ACID Pro
SFN	Font	SPX
SFO	Bitstream font file - fontware format
SFP	PCL 4 bitmap font	portrait - Intellifont - Ventura Publisher
SFR	Sonic Foundry Sample Resource	AWAVE
SFS	PCL 5 scalable font file	Intellifont
SFT	Screen font	ChiWriter
SFV	Simple file verification checksum file	many file verification tools
SFX	Renamed dBASE III screen mask file	dBASE IV
SFX	SFX (self-extracting archives) script	RAR
SG1	Graphics	Stanford Graphics
SGD	Smart Graphics Definition	Crestron VisionTools Pro-E
SGF	Document with graphics	Starwriter
SGF	Smart Game Format	Many board games
SGI	Graphics file	IRIS - Silicon Graphics
SGP	Statistics	STATGRAPHICS Plus
SGT	Save/get keyboard macro	Signature
SH	ASCII archive	SHAR
SH	Unix shell script	Unix shell interpreter
SH3	Presentation	Harvard Graphics 3.0
SH3D	Sweet home 3d file	Sweet home 3d, archivers with ZIP support
SHA1	SHA1 Checksum verification File	HashCheck (Windows)
SHAR	Shell self-extracting archive	UNSHAR (Unix)
SHB	Background	CorelShow
SHG	Segmented Hyper Graphics	Microsoft's shed.exe, JGsoft's Hotspot Builder, EC Software's Help and Manual
SHK	Apple II archive	SHRINKIT
SHM	Shell macro	WordPerfect Library
SHP	Shape file and sdiv id="PYI"> PYIource file for text fonts ESRI shapefile	AutoCAD ArcGIS
SHR	see SHAR
SHS	Shell Scrap Object File	Windows XP and earlier versions
SHT	HTML format for WWW	NetScape
SHTM	SSI-enabled HTM file	Server Side Includes
SHTML	SSI-enabled HTML file	Server Side Includes
SHW	Presentation	Harvard Graphics 2.0 - CorelShow
SHW	Slide show	WordPerfect Presentations, PMview Slide Show
SHX	Shape entities ESRI shapefile	AutoCAD ArcGIS
SIB	Sibelius file	Sibelius 1-5
SID	Sound Interface Device file format	SIDplayer, SIDplay, sidplay2 /w
SIF	Setup Installation Files info	Windows NT Setup
SIG	Current program settings	Signature
SIG	Signature file	gpg, PopMail, ThunderByte AntiVirus
SIK	Backup file (Sicherungskopie)	Microsoft Word
SIM	Simon document file - Simon instruction software editor
SIS	symbian file
SIT	Archive (Macintosh)	STUFFIT
SK	Skin file
SKI	Skin file	?
SKIN	Skin file
SKN	Skin file
SKP	Google SketchUp file
SKY	SYLK Spreadsheet file (used by Multiplan)
SL	S-Lang source code file
SLB	P-CAD library (symbols)	P-CAD
SLB	Slide library	AutoCAD
SLC	SALT (script from Telix) compiled code	Telix
SLD	Slide	AutoCAD
SLDPRT	Part	SolidWorks
SLDASM	Assembly	SolidWorks
SLDDRW	Drawing	SolidWorks
SLI	Slide	MAGICorp Slide Service
SLK	Microsoft Excel import format	Microsoft Excel
SLK	SYLK Symbolic Link format data file	MultiPlan
SLL	Sound data file
SLL	Static Link Library	PowerBASIC
SLN	Microsoft Visual Studio Solution	Microsoft Visual Studio
SLP	SLP command file created by SRCCOM	RT-11
SLP	Localization project file	Sisulizer
SLP	Age of Empires graphics file	Age of Empires (video game)
SLS	Slim source code	Slim (programming language)
SLT	SALT Script Application Language for Telix script source	Telix
SLV	Solution for any game	many
SM	Maillist	SoftSpoken Mailer
SM	Script	ScriptMaker
SM	SMALLTALK source code file
SM	SMath Studio file	SMath Studio
SM	Text file	Samna Word
SM	StepMania Step File	StepMania
SMC	Super MagiCom SNES ROM image	Super MagiCom
SMCLVL	Secret Maryo Chronicles Level	Secret Maryo Chronicles
SMF	Fax	SMARTFAX
SMF	3D World Studio mesh files
SMK	Smacker video Format (RAD Video)
SML	System Macro Library	RT-11
SMM	Ami Pro Macro File	Ami Pro
SMMX	SimpleMind mind map file	SimpleMind
SMN	Font (ParaGraph's WorkScript format)
SMP	Sample (sound file)
SMP	Samplevision File	Samplevision
SMPL	Data	Megahedron 3D object
SMS	MSTS Sound management system file	MSTS
SMT	Text file	Smart Ware II
SMW	Crestron SIMPL Windows project	Crestron SIMPL Windows
SN	Compressed song file	Sound Club editor
SND	Digitized sound file	Macintosh/ATARI/PC
SND	Power Chords drum sound file	Power Chord
SNDB	SQLNotes database	SQLNotes
SNG	Song (midi sound)	Midisoft Studio - Prism
SNG	Saved game file for StarCraft	StarCraft
SNO	SNOBOL4 source code file
SNP	Book-shelf for .BOO	READIBM
SNP	Microsoft Access report snapshot
SNP	Output video format from Computer Eyes equipment
SNX	Saved game file for StarCraft: Brood War	StarCraft: Brood War
SO	shared object, dynamically linked library	Unix, Linux
SOAR	Soar Production file
SOF	Altera FPGA programming file (internal RAM)	Altera Quartus
SOL	Solution e.g. game walkthroughs
SOL	Adobe Flash shared object ("Flash cookie") (Movie, film, video and multimedia file type)	Adobe Flash
SOL	Solidity source code
SOM	Network serial numbers	Quattro Pro
SOM	Sort information	Paradox
SON	Song	SBStudio II
SOU	Temporary BATCH file	RT-11
SOU	SBStudio II Sound File	SBStudio II
SOU	Sound data (sound tool)
SP	Archive (unix)	SPLINT
SPC	Program	Microsoft Multiplan
SPC	Temporary file	WordPerfect for Win
SPC	SNES SPC-700 Sound File	SNES games
SPC	Spectroscopic data (scientific)	Thermo Scientific
SPD	Scalable font	Speedo - Harvard Graphics 3.0
SPF	Slide presentation file	EnerGraphics
SPF	data	SQR Portable Format
SPG	Glossary	Sprint
SPI	Graphics (Siemens and Philips scanner)
SPIFF	Still Picture Interchange File Format
SPIN	Spin source file	Parallax Propeller Microcontrollers
SPL	Archive	SPLINT
SPL	Customized printer driver	Sprint
SPL	Divided file segment	Slice
SPL	Personal spell dictionary	Signature
SPL	Print spooling file	Windows 3.x
SPL	Sample
SPM	Data wp{wp}.spm	WordPerfect
SPP	Printer file	Sprint
SPR	Document letter	Sprint
SPR	Generated executable screen file	FoxPro
SPR	Sprite
SPR	Story Board sprites
SPS	Exported SyncBack profile	SyncBack
SPS	Screen driver	Sprint
SPS	SPSSx source code file	VAX/VMS
SPT	Data support file (MITAC disk/system management utility pack)	MITAC disk/system management utility pack
SPT	SPITBOL source code file
SPW	Worksheet	SigmaPlot
SPX	Compiled executable screen file	FoxPro
SPX	Ogg Speex bitstream[1]	Xiph.Org Foundation
SPZ	Crestron SIMPL Windows compiled program (ZIP format)	Crestron SIMPL Windows
SQ	Squish compressed archive format
SQD	Squish message base	Squish
SQI	Squish message base index	Squish
SQL	Squish message base lastread pointers	Squish
SQL	Structured Query Language	Any SQL database
SQLite	SQLite	Firefox SQLiteBrowser
SQM	Windows Live Messenger log file
SQN	Note file	SquareNote
SQZ	Archive	SQUEEZE
SQZ	FOXPRO Squeeze file	FOXPRO
SRC	Source code (ZIP format)	AMX Netlinx Studio
SRC	Source code	Aurora Compiler
SRC	Multi-edit source	Multi-Edit
SRC	Source	DataFlex
SRF	Sun Raster File graphics file
SRP	Script	QuickLink
SRT	Subtitle format	SubRip
SS	Bitmap graphics	Splash
SS	Screen saver	DN
SSC	Celestia Solar System Catalog file	Celestia
SSC	Stellarium Script	Stellarium
SSD	Datafile	SAS/PC
SSF	Graphic file	SnagIt Studio File/PC
SSFREC	Super Smash Flash 2 replay file	File for Super Smash Flash 2
SSG	Saved game	Simsig
SSIF	Stereoscopic Interleaved file	Media playback devices / software that supports Blu-ray 3D
SSO	Empowered Song	Sertainty
SSP	Datafile	SAS Transport
SSR	FLEXIT Singleshot Survey Raw Data file	FLEXIT
SST	AVHRR graphic file
SSV	Spreadsheet viewer file
ST	Instrument library	Scream Tracker
ST	SMALLTALK source code file	Little Smalltalk
ST	Stamp	NeoPaint
STA	Data file	Statistica
STA	Saved state	Reflection 4.0
STA	Stack	Spinmaker Plus
STB	Symbol table file	RT-11
STB	Stub library	Genus GX Kernel
STC	Celestia Star Catalog file	Celestia
STC	OpenOffice.org XML spreadsheet template	OpenOffice.org Calc
STD	State Transition Diagram graphic file	Prosa
STD	OpenOffice.org XML drawing template	OpenOffice.org Draw
STEAMSTART	STEAMSTART file	Steam (software)
STEP	Standard for the Exchange of Product Data	universal format for CAD exchange
STF	Archive	SHRINKTOFIT
STF	Setup Table File
STI	OpenOffice.org XML presentation template	OpenOffice.org Impress
STK	eBook	Starebook
STK	Stockholm multiple sequence alignment[2]	Bioinformatics tools eg HMMER, Xrate, Jalview
STL	Stereolithography Interface Format
STL	Subtitle files EBU-standard
STM	SSI-enabled HTML file	Server Side Includes
STM	Music format (4 channels) (Scream Tracker Module)	ST - DMP
STM	State Transition Diagram model file	Prosa
STO	Pascal stub OBJ file	Genus GX Kernel
STO	Stockholm multiple sequence alignment[2]	Bioinformatics tools eg HMMER, Xrate, Jalview
STP	Subtitler Project	Belle Nuit Subtitler
STP	Standard for the Exchange of Product Data	universal format for CAD exchange
STR	Gate3 table structure file
STR	Structure list object file	dBASE Application Generator
STR	PlayStation video file
STRINGS	Strings file	Apple
STS	Music format (Scream Tracker Song)	ST 2.0-2.3
STS	Project status info	Microsoft C/C++
STU	Studio Project	Pinnacle Studio (video editing software)
STUFF	EVE Online compressed file archive	CCP hf
STW	Data file	SmartTerm for Windows
STW	OpenOffice.org XML text document template	OpenOffice.org Writer
STX	Electronic book	SmarText
STX	Music format
STX	Tax form	CA-Simply Tax
STY	Ami Pro Template (Style); used by other programs for `styles`	Ami Pro
STY	Style library or sheet	many
SU	Saurus source file
SU?	Packed mail	FTN software
SUB	Subtitle format	SubViewer; Author David Dolinski
SUC	Saurus byte-code file	Saurus VM
SUF	Sony camera configuration file (setup.suf)	XDCAM-EX camcorders
SUI	SUIT library	Simple User Interface Toolkit
SUM	Summary
SUN	Sun rasterfile graphics file	Sun Microsystems
SUO	Solution User Options	Microsoft Visual Studio
SUP	Subtitle file (Blu-ray encapsulated container)	SupRip
SUP	Supplementary dictionary	WordPerfect for Win
SUR	Surface topography (in native "SURF" format)	MountainsMap
SV4	Saved Game File	RollerCoaster Tycoon
SV6	Saved Game File	RollerCoaster Tycoon 2
SVC	Represents the ServiceHost instance hosted by Internet Information Services	Windows Communication Foundation
SVD	Autosave file for document	Microsoft Word
SVG	Autosave file for glossary	Microsoft Word
SVG	Scalable Vector Graphics	many
SVQ	MRC-Pro sequencers music format	Roland Corporation synths such as XP or Fantom series
SVS	Autosave file for style sheet	Microsoft Word
SVW	Super Video Windows	Conversion Artist
SVX	Interchange, 8SVX/16SV	AWAVE
SVY	FLEXIT Survey data	FLEXIT
SW	Raw Signed Word (16bit) data	AWAVE
SWF	Shockwave Flash	Macromedia
SWG	SWIG source code	SWIG
SWG	SWAG Pascal Snippets file	SWAG
SWIFT	Swift source code	Swift (programming language)
SWM	split Windows Imaging Format	ImageX, DISM, 7-Zip, wimlib
swmProBckProj6	Medialon Showmaster Pro Project Backup	Medialon Showmaster Editor 2
swmProProj6	Medialon Showmaster Pro Project	Medialon Showmaster Editor 2
swmTmpVarStor6	Medialon Showmaster Editor Backup Variable Storage	Medialon Showmaster Editor 2
swmVarStor6	Medialon Showmaster Editor Variable Storage	Medialon Showmaster Editor 2
SWP	Document backup	Sprint
SWP	Swap file	vim
SWT	Hump Routes File	FYM
SXC	OpenOffice.org XML spreadsheet	OpenOffice.org Calc
SXD	OpenOffice.org XML drawing	OpenOffice.org Draw
SXG	OpenOffice.org XML master document
SXI	OpenOffice.org XML presentation	OpenOffice.org Impress
SXM	OpenOffice.org XML formula	OpenOffice.org Calc
SXP	3DS Process file	3D Studio
SXW	OpenOffice.org XML text document	OpenOffice.org Writer
SY1	SmartPix symbol library	Ami Pro
SY3	Harvard Graphics format
SY3	Symbol file	Harvard Graphics 3.0
SYD	Backup of startup files created by QEMM (?) autoexec.syd
SYD	Sysedit backup file	Sysedit
SYG	Monitor and handler files created by SYSGEN	RT-11
SYM	Compiler symbolic information file
SYM	P-CAD component (symbols)	P-CAD
SYM	Precompiled headers	Borland C++
SYM	Program symbol table	Power C, Microsoft ILink incremental linker
SYM	Symbol file	Harvard Graphics 2.0, Microsoft Windows SDK
SYMX	DSP project	Symetrix Composer
SYN	SDSC Synu image file	SDSC Image Tool
SYN	Synonym file	Microsoft Word 5
SYS	Datafile	SYGRAPH - SYSTAT - SPSS/PC
SYS	System file - device driver or hardware configuration info	DOS
SYW	Graphics file (symbol)	Harvard Graphics Win
SYW	Yamaha SY-85/SY-99 Wave File	Convert (c) Villena
SZPROJ	SZInstallSystem Project	SoftwareZator 2011 Standart Edition
SZS	Method of compressing used by Nintendo	Various Nintendo games

T

Ext.	Description	Used by
T	TADS source
T	Tester symbol table	ReaGeniX code generator
T?H	Turbo Help file (Pascal, C, Assembler, ...)	Borland Thelp
T$M	AVG scan log files[3]	AVG
T2B	Bookeen Cybook thumbnail	Cybook
t2flow	Taverna 2 workflow definition	Taverna workbench
T2L	True2Life file format	3D Internet content developers
T44	Temporary file for Sort or Index	dBASE IV
T64	Program	C64S emulator
TAF	Tango Application File, a server-side script	Tango Enterprise (Pervasive Software)
TAG	Query tag name	DataFlex
TAH	Help file for Turbo Assembler	Borland C++
TAK	Audio codec, Lossless audio file format	Winamp (+Plugin), foobar2000 (+Plugin), Media Player Classic - BE
TAL	Adobe Type Align	Adobe
TAL	Text illustration	TypeAlign
TAP	Tape file	ZX Spectrum emulator by g.a.lunter
TAR	tar archive	tar, many file archivers with TAR support
TAZ	compressed tar archive	tar, many file archivers with TAR and COMPRESS support
TB	Tab file (Virtual Desktop Tab)	Tabbery
TB1	Font file	Borland Turbo C
TB2	Font file	Borland Turbo C
TBF	Fax	Imavox TurboFax
TBK	FOXPRO template backup file	FOXPRO
TBK	Memo backup	dBASE IV - FoxPro
TBK	Toolbook	Asymetrix ToolBook
TBL	Short for "Table"	used by many programs
TBL	Aldus TableEditor file	TableEditor
TBL	binary Unicode conversion table	Volkov Commander, DOSLFN
TBL	Gate3 table file
TBL	Graphics file (native format)	PageMaker TableEditor
TBL	Table of values	OS/2
TBR	Norton Desktop custom toolbar	NDW
TBS	Text elements ?? (Textbausteine)	Microsoft Word
TBX	Table	Project Scheduler 4 - TermBase eXchange (ISO 30042)
TBZ	Archive	WinZipNT - TAR - Bzip2
TC	Configuration	Turbo C - Borland C++
TCC	TI-Nspire OS upgrade file	TI-Nspire CX CAS
TCH	Help file	Turbo C - Borland C++
TCL	Tool Command Language source code	Tcl
TCO	TI-Nspire OS upgrade file	TI-Nspire CX
TCT	Drawing Template	TurboCAD for Windows
TCW	Native Drawing File	TurboCAD for Windows
TD	Config from Turbo Debugger	Turbo Debugger
TD0	Compressed disk image file	Teledisk
TD1	Multi-part disk image file	Teledisk
TD2	Configuration file	Turbo Debugger for Win32
TDB	Database	TACT
TDDD	Imagine Object File Format	Imagine
TDESKTOP-PALETTE	Palette	Telegram Desktop
TDF	Speedo font file
TDF	Typeface definition file	Speedo
TDH	Help file for Turbo Debugger	Borland C++
TDK	Keystroke recording file	Turbo Debugger
TDR	Contents of Arvid tape
TDS	Symbol table	Turbo Debugger
TDT	Thumbnail data	AVCHD
TDW	Configuration file	Turbo Debugger for Windows
TEC	Data	TECPLOT output
TEC	TECO macro file ("compiled" form)	TECO
TEF	Fax	Relisys TEFAX
TEL	Host file	Telnet
TEM	Input template	IconAuthor
TEM	Turbo Editor Macro Language script	Borland C++
TERM	Terminal File
TES	TECO macro file (source form)	TECO
TET	Tetris results	DN
TEX	Datasheet	Idealist
TEX	TeX text file	Scientific Word - TeX
TEX	Image	Slimtex
TEXT	Text file
TF	Configuration	Turbo Profiler
TFA	Area file	Turbo Profiler
TFC	Catalogue file	Tobi's Floppy Cataloguer
TFF	self executing TansForm dialogue	TansForm
TFH	Help file for Turbo Profiler	Borland C++
TFM	Tagged font metric file	Intellifont
TFM	TeX font metric file	TeX
TFS	Statistical information	Turbo Profiler
TG1	Project file	On Target
TGA	Targa bitmap	Paint.NET, many raster graphics editors
TGZ	gzip compressed tar archive	tar, many file archivers with TAR and GZIP support
TH?	Packed mail	FTN software
THE	Windows'95 Desktop Theme	Microsoft Plus
THEME	Windows Theme	Microsoft Windows 95 with Plus!, 98 and later
THEMEPACK	Windows Theme package	Microsoft Windows 7 and later, many file archivers with CAB support
THM	Thumbnail or Theme File	Picture Publisher, PhotoMagic, Canon Digital Cameras, and Sony Digital Cameras create these Thumbnail files; also used for Sony Ericsson Theme File, for a cell phone
THP	Nintendo proprietary video format	Various Nintendo games
THR	ThredWorks Embroidery Format	Thred, Embroidermodder
THS	Thesaurus dictionary	WordPerfect for Win
TIB	Acronis True Image Backup	Acronis True Image
TIC	FTN special file with assotiated file description	ALLFIX
TIF	see TIFF
TIFF	TIFF (tagged image format file) bitmapped file	Alchemy - PhotoStyler -PageMaker - CorelDRAW
TIGER	Tomb Raider binaries files	Ubi
TIL	Fuzzy logic knowledge base	Togai InfraLogic Fuzzy-C Compiler
TIP	Digital Signage Presentation	Tru-Designer, Tru-Player, Tru-Scheduler part of Tru-i Suite[4]
TIS	Tile set	MahJongg 3.0
TJL	Backup file	VAXTPU editor
TKN	AMX Netlinx compiled program	AMX Netlinx Studio
TLB	Reference table	Bubble Chamber
TLB	Text library	VAX
TLB	Type library	A binary file with information about a COM or DCOM object so other applications can use it at runtime. Created by Visual C++ or Visual Studio. Used by many Windows applications.
TLC	Compiled Tool Command Language source code	Swat
TLD	Disk Image	Teledisk
TLG	Transaction Log	Intuit QuickBooks
TLH	Typelib Generated C/C++ Header	Visual C++
TLP	Project	TimeLine
TLX	Website builder	Trellix
TM2	Typical Meteorological Year data (new)	Typical Meteorological Year
TMC	TI-Nspire OS upgrade file	TI-Nspire CM-C CAS
TMF	Tagged Font Metric file	WordPerfect for Win
TMF	Tesira DSP configuration file	Biamp Tesira
TMF	TiVo movie	TiVo
TMO	ZTG global optimizer default output file	Zortech C++
TMO	HandsHigh ThoughtManager Outline	ThoughtManager Desktop
TMO	TI-Nspire OS upgrade file	TI-Nspire CM-C
TMP	Temporary file	(Several programs)
TMPL	Template
TMS	TeleMate compiled script	TeleMate
TMY	Typical Meteorological Year data (old)	Typical Meteorological Year
TMY2	Typical Meteorological Year data (new)	Typical Meteorological Year
TNC	TI-Nspire OS upgrade file	TI-Nspire CAS
TNO	TI-Nspire OS upgrade file	TI-Nspire
TNS	TI-Nspire document	TI-Nspire series
TOC	Table Of Contents text file (ASCII)
TOCG	TorgaNET Diplomatic Cables	State Department of Torga
TOK	Borland C++ 4.x reserved word list	BCW.EXE
TOG	TorgaNET	TorgaNET database file
TOPC	TopicCrunch SEO Project file holding keywords, domain and search engine settings (ASCII)
TORRENT	TORRENT File	BitTorrent clients (various)
TOS	Character file	The Only Sheet
TOS	Self-extracting file archive (Atari ST)
TP	Session-state file	Turbo Profiler
TP	Turbo Pascal cfg file	Turbo Pascal
TP	TinkerPlots Document	TinkerPlots and Fathom Dynamic Data Software; documents contain data tables, graphs, text, pictures, etc.
TP3	Template	Harvard Graphics 3.0
TP4	TPDesign4 project	AMX TPDesign4
TP5	TPDesign5 project	AMX TPDesign5
TPB	Downloadable PCL Soft font file backup	HiJaak
TPC	File produced when an inter-Topicscape topic link file is exported to Windows	3D Topicscape
TPF	Downloadable PCL Soft font file	HiJaak
TPF	Print data in EMF format	ThinPrint
TPH	Help file	Turbo Pascal
TPL	Resident units library	Turbo Pascal
TPL	Template file	GoldEd -ITrack
TPL	Template	Harvard Graphics 2.0
TPOLY	Data	TPOLY 3D object
TPP	Protected Mode Units	Borland Pascal 7.0
TPT	Digital Signage Presentation Template	Tru-Designer, Tru-Scheduler part of Tru-i Suite[4]
TPU	Borland Pascal DOS Mode Library	Borland Pascal
TPU	Command file (VAXTPU editor)	VAXTPU editor
TPW	Borland Pascal Windows Library	Borland Pascal
TPW	Session-state file	Turbo Profiler for Windows
TPZ	gzip compressed tar archive	tar, many file archivers with TAR and GZIP support
TR	Man page input suitable for troff -man	cawf2.zip
TR	Session-state settings	Turbo Debugger for DOS
TR2	Session-state settings	Turbo Debugger for Win32
TRC	Debug support file	Power CTrace
TRASH	File found during a file scan as bugged	Windows
TRE	Directory tree file	PC-Tools
TRD	Datafile	TrID file identifier filetypes definitions package
TRIA	Data	Greg Hood's ASCII Triangle
TRIB	Data	Greg Hood's Binary Triangle
TRIF	Tiled Raster Interchange Format
TRK	Track (i.e. video sequence), used by many games
TRM	Terminal settings	Windows 3.x
TRN	Translation support file	Quattro - Clarion
TRP	MPEG-2 Part 1 multiplexed video stream	Digital video broadcast, DVRs, video players
TRS	Executable file	Micrografx or password file
TRS	WiSo Mein Geld 2007
TRS	IBM Mainframe log file	TRSMAIN
TRU	True Basic source file
TRW	Session-state settings	Turbo Debugger for Windows
TRY	Typical Meteorological Year data (variant)	TRNSYS
TS	MPEG transport stream	Various media players / software
TS	Qt Linguist TS File	Trolltech Qt Linguist
TS	Touchstone V2 Network Parameter Data	Vector Network Analyzers
TS	TypeScript source file
TSE	Data	Light Map Maker ASCII Scene
TSK	Microsoft Multimedia Task Application	Win95
TSL	Exported Schedule	Tru-Scheduler part of Tru-i Suite
TSM	Turbo Assembler Manual	TASM for OS/2
TST	Printer test file	WordPerfect for Win
TST	ExamView papers and online tests	can be opened with WinRAR, ExamView, and TestGen software.[5]
TSV	Tab Separated Values
TTE	TrueType Font file	Windows EUDC editor
TTF	TrueType Font file
TTL	Turtle (syntax) file	Resource Description Framework
TU?	Packed mail	FTN software
TUD	The Ultimate Draw file	The Ultimate Draw
TUT	Tutorial
TV	Table view settings	Paradox
TVF	Table view settings	dBASE
TVn	Overflow file above insert point in Doc n	WordPerfect for Win
TWF	Warp Map File	Geo Semiconductor, Inc eWarp Pro Development Took Kit
TXC	Test Configuration Format
TXF	Tax eXchange Format
TXI	Support file	TeX
TXT	Common name for ASCII text file	Microsoft Notepad
TXT	Tab-Delimited Text File	Microsoft Excel
TXT	Document Extension	TextEdit
TXW	Yamaha TX-16W Wave File	Convert (c) Villena
TY	TiVo movie	TiVo
TYM	Time Stamp (PageMaker 4)	PageMaker 4
TZ	Archive	TAR - COMPRESS
TZB	Archive	TAR - COMPRESS - BTOA
TZL	Tanzzle pattern file	Tanzzle
TZX	Tanzzle image file	Tanzzle
TZX	Tape image file	Common 8bit tape files [6] Original from ZX Spectrum

U

Ext.	Description	Used by
U3D	Model file format	Ultimate 3D
U3D	Universal 3D	Adobe Acrobat
U8	Sample
UB	Raw Unsigned Byte (8bit) data	AWAVE
UC2	Archive	UC II
UCN	New archive	UC II
UCS	Unknownsoft Service Pack (mainly for Shadow OS 2009)	Unknownsoft Computer Systems
UDF	Filter	Aldus Photostyler
UDO	Data	Moray User Defined Object
UDIWWW	bookmark data	UdiWWW
UDW	Raw Unsigned DWord data	AWAVE
UE2	Encrypted archive	UC II
UF2	USB Flashing Format	Microsoft MakeCode file for flashing microcontrollers
UFI	data	UFO CaptureV2 settings -
UFO	graphic file	Ulead Photo Impact
UHA	UHarc archive
UHS	Universal Hint System (binary file)
UI	Espire source code file	Geoworks UI Compiler Geos
UI	Qt Designer's UI File	Trolltech Qt Designer
UI	User interface	Sprint
UIF	Long prompts for windows	WordPerfect for Win
UIH	Espire header file	Geoworks UI Compiler Geos
UL	ULAW audio file
ULD	Information about uploaded files	Procomm Plus - Datastorm Technologies, Inc.
ULF	data	MRF Mapping Tool Kit Universal List Format
ULT	Music	UltraTracker
UMB	Backup file	MemMaker
UMC	Crestron SIMPL Windows module	Crestron Simpl Windows
UMP	Umple UML Programming Language Format	Umple
UMX	Unreal Music Package	Unreal Tournament
UNF	Universal NES Image Interchange File Format
UNI	Datafile	Forecast Pro
UNI	Music format	UNIMOD - MIKMOD
UNIF	Universal NES Image Interchange File Format
UNV	Text file containing finite elements nodal coordinates and more See notes	Originally used by SDRC for its I-deas software; a lot of simulation software use it today
UNX	Text file containing UNIX specific info
UOML	UniqueObject Markup Language (UOML) is a XML-based markup language
UOP	Uniform Office Format presentation
UOS	Uniform Office Format spreadsheet
UOT	Uniform Office Format text
UPD	Update data	dBASE
UPO	Compiled update data	dBASE
URL	Internet Shortcut (URL)	Windows Explorer
URT	Utah Raster Toolkit
USDZ	Augmented Reality (AR) File	Apple, Pixar
USE	Log file
USL	Crestron SIMPL+ library source code	Crestron SIMPL Windows
USP	Crestron SIMPL+ module source code	Crestron SIMPL Windows
USP	Printer font with USASCII extended character set	Adobe PageMaker
USR	User database file	Procomm Plus - Turbo C++ tour
UST	UTAU vocal track	UTAU
UT!	datafile	uTorrent
UTZ	Mobile Phone Theme	Sony Ericsson
UU	Encoded file (ASCII)	UUENCODE/UUDECODE - Uuencoding
UUE	Encoded file (ASCII)	UUENCODE/UUDECODE - Uuencoding
UW	Raw Unsigned Word 16bit data	AWAVE
UWF	UltraTracker WaveSample	UltraTracker
UXP	Empowered Data Object	Sertainty
UZED	Compressed Unicode GEDCOM file	Family Tree Builder

V

Ext.	Description	Used by
V	Consistency check support file	ReaGeniX code generator
V	Main input file for an image	Vivid 2.0
V	Coq source file
V	Verilog source file
V1, V2, ...	Split parts of a whole file	JJSplit
V4P	vvvv patch	vvvv
V64	Nintendo 64 ROM	Nintendo 64 emulators
V8	Covox 8bit file	AWAVE
V10	Data	Gouraud Shaded Vectors
V2D	Voucher design file	Voucher management included in JFire (e.g. when printing a voucher)
VAI	multimedia	PhotoDub document
VAL	Validity checks and referential integrity	Paradox for Windows
VAL	Values list object file	dBASE Application Generator
VALA	Sourcecode	Vala
VAN	Animation	VistaPro
VAP	Value Added Process	NetWare 2.xx
VAP	Dialogic indexed adpcm voice file	VBASE/40
VAR	Variable file	IconAuthor
VB	Visual Basic .Net source file	Visual Basic .NET
VBOX	virtual machine settings file (in XML format)[7]	VirtualBox
VBOX-EXTPACK	VirtualBox extension package[8]	VirtualBox
VBOX-PREV	backup of virtual machine settings file	VirtualBox
VBPROJ	Visual Basic .Net project file	Visual Basic .Net Express and Visual Studio 2003-2010 Project
VBR	Visual Basic Custom Control file	Visual Basic
VBS	VBScript script file	VBScript
VBX	Visual Basic eXtension	Visual Basic
VBZ	Visual Basic Setup Wizard Template	Setup Wizard
VC6	Graphite - 2D and 3D drafting	Ashlar-Vellum
VC	Include file with color definitions	Vivid 2.0
VC	Spreadsheet	VisiCalc
VCA	Visual Clip Art
VCD	VideoCD
VCD	VirtualDrive CD Image File
VCD	Value Change Dump (Verilog) temporal database file
VCD	VisualCADD Drawing File
VCE	Visual CertExam File	VCE Exam Simulator
VCF	Virtual Contact File
VCLS	VocaListener voice scanner file	VocaListener Plug-in (Vocaloid3)
VCR	VCR drivers for Arvid
VCW	Visual workbench information	Microsoft Visual C++
VCX	Spreatsheet	VisiCalc Advanced
VDA	Targa bitmap graphics	many raster graphics editors
VDI	Virtual Disk Image	VirtualBox
VDO	Story Board video image	Story Board
VDOC	Vector Document File	a Future Corporation Pty. Ltd. (Australia)
VDR	Drawing	ComputerEasy Draw
VDW	Visio web drawing	Microsoft Visio
VDX	Visio XML drawing	Microsoft Visio
VEG	Vegas Project	Sony Vegas
VEW	GroupWise for Windows	Win
VEW	View file	Clipper 5 - Lotus Approach
VF0	Database file	OTExpert 5
VFA	FontLab Database file	FontLab
VFD	Virtual Floppy Disk	Windows Virtual PC (among others)
VFM	Ventura Font Metrics file
VFM	Voting Form	Voter
VFN	Voting Form for Customers	Voter
VGA	VGA display driver
VGA	VGA display font
VGD	VGA display driver	Generic CADD
VGM	Video Game Music audio format
VGR	Graphics file	Ventura Publisher
VHD	VHDL source file
VHD	Virtual Hard Disk	Windows Virtual PC (among others)
VHDX	Virtual Hard Disk v2	Microsoft Hyper-V (among others)
VI	LabVIEW Virtual Instrument	LabVIEW
VI	Graphics file	Jovian Logic VI
VI	Watcom editor script	VI.EXE
VIA	VIA Document Project	VIA Text Editor
VIC	see VICAR
VICAR	Graphics (Video Image Communication and Retrieval)
VID	Bitmap graphics (YUV12C M-Motion Frame Buffer)
VID	Graphics format	Word&Deed
VID	MS-DOS Shell Monitor file	MS-DOS 5
VID	Screen device driver	Word
VIF	see VIFF
VIFF	Khoros Visualization Image File Format	SDSC Image Tool
VIK	Graphics format (VIKING)
VIM	Vim script file	Vim text editor
VINF	data	ReMPEG log file - frames info
VIR	Virus or infected file
VIS	VIS graphics file
VLM	Vellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoard	Ashlar-Vellum
VLM	Virtual Loadable Module	Netware
VLOGO	Vector Logo File	a Future Corporation Pty. Ltd. (Australia)
VM	Virtual Memory file	Geoworks
VMC	Virtual memory configuration	DOS/4GW PM 32X DOS Extender
VMCZ	Hyper-V Exported Virtual Machine	Microsoft
VMDK	Virtual Disk file	VMware
VMF	Font characteristics	Ventura Publisher
VMG	Nokia message file format	Text Message Editor (Nokia PC Suite)
VMS	Text file containing VMS specific info
VMT	Source Engine resource file	Source Engine
VO	Include file with object definition	Vivid 2.0
VOB	Video Object	DVD-R, DVD-RW
VOC	Sound format (Creative Lab's Sound File)	PlayVoc
VOF	Object folder	VZ Programmer
VOP	Visual Orangator Project
VOP	Visual OTTHYMO Project
VOX	Dialogic adpcm file	AWAVE, CoolEdit
VP	3DS Video posting	3D Studio
VPF	Vector Product Format
VPG	Graphics file	VPGraphics
VPH	Virtual Pascal Help	VP/OS2
VPI	Virtual Pascal Unit	VP/OS2
VPM	Garmin Voice Processing Module
VPP	Visual Paradigm Project	Visual Paradigm for UML
VQA	Vector Quantized Animation	The Legend of Kyrandia
VQM	Hardware description language	Altera
VRM	Overlay file	QuattroPro
VRM	Visual rexx source	WATCOM VREXX
VRML	Virtual Reality Modeling Language	NetScape
VRP	Project	WATCOM VX?Rexx
VRS	Video Resource e.g. video device driver	WordPerfect
VS	Vellum Solids	Ashlar-Vellum
VS	Include file with surface definition	Vivid 2.0
VSD	Diagram	Shapeware Visio
VSD	Visio drawing	Microsoft Visio
VSDM	Visio macro-enabled drawing	Microsoft Visio
VSDX	Visio drawing	Microsoft Visio
VSL	Visio add-on	Microsoft Visio
VSM	Visual Simulation Model	VisSim
VSP	Sprite	SPX
VSQ	Vocal synthesizer track data	Vocaloid2, Vocaloid3
VSQX	Vocal synthesizer track data	Vocaloid3
VSS	SmartShapes file	Shapeware Visio
VSS	Visio Stencil	Microsoft Visio
VSSM	Visio Macro-enabled Stencil	Microsoft Visio
VSSX	Visio Stencil	Microsoft Visio
VSSX	Visio Stencil	Microsoft Visio
VST	Truevision Vista graphics	many raster graphics editors
VST	Visio Template	Microsoft Visio
VSTM	Visio Macro-enabled Template	Microsoft Visio
VSTO	Microsoft Office add-in file	Microsoft Visual Studio
VSTX	Visio Template	Microsoft Visio
VSVNBAK	VisualSVN Server repository backup	VisualSVN Server
VSX	Visio XML stencil	Microsoft Visio
VTF	Source Engine resource file	Source Engine
VTP	VisionTools Pro-E project	Crestron VisionTools Pro-E
VTT	VisionTools Pro-E project	Crestron VisionTools Pro-E
VTX	Visio XML template	Microsoft Visio
VTZ	VisionTools Pro-E compiled project	Crestron VisionTools Pro-E
VUE	Animation	3D Studio
VUE	View	dBASE IV - FoxPro
VVV	Video game save	VVVVVV
VW	Text file	VolksWriter
VWR	File viewer file	PC Tools
VWX	CAD File	VectorWorks 2008
VXD	Windows 3.x virtual device driver	Windows 3.x
VZT	Temporal database file	GTKWave data file

W

Ext.	Description	Used by
W	Word chart file	APPLAUSE
W01	Yamaha SY-series wave files	AWAVE
W01	Yamaha TX16W wave file	AWAVE
W30	Printer font	AST TurboLaser - Ventura Publisher
W31	Startup file	Windows 3.1
W3A	Warcraft III Abilities Export File	Contained in a Warcraft III map
W3B	Warcraft III Destructables Export File	Contained in a Warcraft III map
W3D	Warcraft III Doodads Export File	Contained in a Warcraft III map
W3D	Westwood 3D object format	3D models used in Renegade and Generals
W3D	Shockwave 3D object format
W3G	Warcraft III Replay File	File for Warcraft III
W3H	Warcraft III Buffs Export File	Contained in a Warcraft III map
W3M	Warcraft III Map	File for Warcraft III: Reign of Chaos
W3N	Warcraft III Campaign	File for Warcraft III: The Frozen Throne
W3O	Warcraft III Object Data Export File	Contained in a Warcraft III map
W3P	Warcraft III Save	Save File for Warcraft III
W3Q	Warcraft III Upgrades Export File	Contained in a Warcraft III map
W3T	Warcraft III Item Export File	Contained in a Warcraft III map
W3U	Warcraft III Unit Export File	Contained in a Warcraft III map
W3V	Warcraft III Save	Save File for Warcraft III
W3X	Warcraft III Expansion Map	File for Warcraft III: The Frozen Throne
W3Z	Warcraft III Save	Save File for Warcraft III
W40	renamed system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS,DBLSPACE.BIN.DRVSPACE.BIN,MSDOS.SYS) of Windows version	Windows 95, 98, ME (dual-boot feature)
W44	Temporary file for Sort or Index	dBASE
W95	Something for Windows95	Win95
WAD	Where's All the Data?	Doom - Doom2
WAD	Nintendo proprietary format for Wii channels, menus, etc.	Nintendo Wii
WAG	Yard Contents File	FYM
WAI	Warcraft III AI Data File	Warcraft III AI Data File
WAR	Java Web Archive	A Java file format used to package and deploy web applications
WAS	ProComm Script File (source code)	ProComm
WAV	Sound format (Microsoft Windows RIFF WAVE)	Media Player
WAX	TVTonic WAX video packaging	Wavexpress TVTonic
WAX	ProComm compiled script	ProComm
WAX	Windows Media Audio Shortcut	Windows Media Player (Windows Media Audio Redirector)[9]
WB1	Notebook	Quattro Pro
WB2	Spreadsheet	Quattro Pro
WBF	Microsoft Windows Batch File	Catch
WBK	Document/workbook or Microsoft Word backup file	WordPerfect for Win or Microsoft Word
WBT	Norton Desktop	Norton Desktop
WBT	Wilsonware Batch file	Winbatch
WCD	Condes Event Data file	Condes
WCD	Macro token list	WordPerfect for Win
WCH	WordPerfect Macro Facility	WP
WCM	Data transmission file	Microsoft Works
WCM	Macro	WordPerfect for Win
WCP	Product information description	WordPerfect for Win
WD	InfoSelect Data file
WDB	Database	Microsoft Works
WDB	World Database	Lego Island
WDM	Admin tool connection definition	War FTP
WE?	Packed mail	FTN software
WEB	WEB source code file	Web Easy Professional
WEBLOC	Web internet location	macOS
WebOOGL	Web Object Oriented Graphics Library
WFB	Turtle Beach WaveFront Bank	AWAVE
WFD	Turtle Beach WaveFront Drum	AWAVE
WFM	Form object	dBASE Form Designer
WFN	Font	CorelDRAW
WFP	Turtle Beach WaveFront Prog.	AWAVE
WFT	Web Family Tree	GRAMPS
WFX	Data file	Winfax
WG1	Worksheet	Lotus 1-2-3/G
WG2	Worksheet	Lotus 1-2-3 for OS/2
WID	Width table	Ventura Publisher
WIFI	Torga OS Wifi Settings Database	14th Information Division (Torga)
WIKI	Wiki markup (various flavors)	Wikis
WIM	Windows Imaging Format	ImageX, DISM, 7-Zip, wimlib
WIN	Window file	FoxPro - dBASE
WIREFRAME	Data	EMSE mesh
WIX	Windows Installer XML	WiX
WIZ	Page wizard	Microsoft Publisher
WK1	Spreadsheet	Lotus 1-2-3 version 2.x - Lotus Symphony 1.1+
WK3	Spreadsheet	Lotus 1-2-3 version 3.x
WK4	Spreadsheet	Lotus 1-2-3 version 3.4
WKB	Document	WordPerfect for Win
WKE	Spreadsheet	Lotus 1-2-3 educational version
WKF	VISI Working file	Vero Software
WKI	Spreadsheet format	Lotus 123 2x
WKQ	Spreadsheet	Quattro
WKS	Spreadsheet	Lotus 1-2-3 version 1A - Lotus Symphony 1.0, Microsoft Works
WKS	Workspace	Xlisp
WKZ	Spreadsheet format	Dos Navigator
WLK	Graphics	Virtus Walkthrough
WLK	Walk Through for any game	many
WMA	Windows Media Audio audio file
WMC	Backup of startup files by Windows MathCad autoexec.wmc	MathCad
WMC	Macro file	WordPerfect for Win
WMC	Text file	WordMARC
WMDB	Windows Media Player database	Windows Media Player
WMF	Windows MetaFile vector graphics
WMO	WoW Map Object	Blizzard Entertainment games (World of Warcraft/Warcraft series)
WMP	Graphics (Windows Magic Icon Palette)
WMS	Windows Media Player Skin File	Windows Media Player
WMV	Windows Media Video video file
WN	Text	NeXT WriteNow
WNF	Corel Draw Font File	CorelDraw
WOA	Swap file	Windows 3.x
WOC	Organization	Windows OrgChart
WOFF	Web Open Font Format
WOFF2	Web Open Font Format
WORKFLOW	Workflow	macOS
WOW	Music (8 channels)	Grave Mod Player
WP	Word Perfect Format	WP
WP5	Document	WordPerfect 5.x
WPD	Document	WordPerfect 6.0 - PFS:WindowWorks
WPD	Windows printer driver (uninstallable)	Windows
WPF	Fax	WorldPort
WPF	Form	WordPerfect
WPG	WordPerfect Graphics vector graphics	DrawPerfect
WPJ	Watcom C/C++ IDE project	IDE.EXE
WPK	Macros	WordPerfect for Win
WPL	MediaRack Wave Playlist	MediaRack
WPL	Windows Media Playlist	Windows Media Player
WPM	Macros	WordPerfect
WPS	Text document	WPS Office, Microsoft Works
WQ!	Compressed spreadsheet	Quattro Pro
WQ1	Spreadsheet	Quattro Pro
WR1	Spreatsheet	Lotus Symphony 1.1 - 1.2 - 2
WRD	Template	Charisma
WRI	Write editor format	Write - WinWord
WRK	Spreadsheet	Lotus Symphony 1.0
WRL	VRML file
WRP	Archive	Amiga WARP
WRS	Windows Resource e.g. might indicate error if word cannot open	WordPerfect for Win
WS	APL Worksheet
WS	Document	WordStar 5.0-6.0
WS2	Text file	WordStar 2000
WS7	RS7 Setting	Redshift 7
WSD	Document	WordStar
WSF	Windows Script File	Microsoft Windows Script Host
WSF	WordStar Font file	WordStar
WSP	Workspace	Fortran PowerStation
WSQ	Wavelet-packet Scalar Quantization Format
WSRC	X-wais source
WST	Text file	WordStar
WSV	Keysight SystemVue Workspace file	Keysight SystemVue
WTR	Working Timetable rules file	Simsig
WT	Parameter or data dump file	WildTangent or MongoDB
WTT	Working Timetable timings file	Simsig
WTF	World of Warcraft Data File	World of Warcraft
WTF	WinTaper Data
WV	WavPack
WWB	Button bar for document window	WordPerfect for Win
WWF	WWF Document Format
WWK	Keyboard layout	WordPerfect for Win
WXH	Program/Script File	WaxHtml Web Programming Language
WXP	Document	EXP for Windows
WZ	Wizet game archive file	Wizet/Nexon MapleStory
WZA	Encrypted archive file	Department of Defense Encryption Wizard (Public Edition)

X

Ext.	Description	Used by
X	Archive	X1.EXE
X	AVS X image file	SDSC Image Tool
X	DirectX 3D object
X	LEX source code file
X	XBasic Source code file	Xbasic
X3D	x3d and xdart Formats
X3G	Makerbot-specific gcode	Makerbot 3D printers (gen5 and earlier), Makerbot desktop
X86	Executable file for x86 processors
X86_64	Executable file for x86-64 processors
X64	Executable file for 64-bit processors
XA	XA audio file	used in SimCity 3000 by Maxis, also by Sony PlayStation
XADR	Toolbox address book file	Crestron Toolbox
XAR	Xara graphics file	Files created by Xara Photo & Graphic Designer (formerly Xara Xtreme and Xara Studio); early versions used the extension ART
XAR	eXtensible ARchive	xar, 7-Zip
XBE	Xbox Executable	Xbox
XBM	X11 Bitmap graphics file
XBRL	eXtensible Business Reporting Language instance file	eXtensible Business Reporting Language
XCF	Gimp image file	GNU Image Manipulation Program
XCK	Extended crack file (usually text)
XCL	Xtree for Windows Script file	Xtree for Win
XDF	OS/2 extended disk format image	XDFCOPY.EXE
XDM	Directory Manipulator for 32-bit Protected Mode	Xenotech Research Labs
XE	Xenon - for Associative 3D Modeling	Ashlar-Vellum
XEPH	PixInsight Solar System Ephemeris Data File	PixInsight
XEX	Xbox 360 Executable File
XFN	Printer font	Xerox 4045 - Ventura Publisher
XFR	Ventura Publisher Bitmap Editor Font file
XFT	24 pin printer font	ChiWriter
XI	FastTracker 2 instrument file	AWAVE
XIF	Xerox Image Format	Pagis Pro 2.0 and 3.0
XISB	Extensible Image Serialization Format (XISF data blocks file)	PixInsight (see XISF 1.0 Specification)
XISF	Extensible Image Serialization Format (monolithic XISF file)	PixInsight (see XISF 1.0 Specification)
XISH	Extensible Image Serialization Format (XISF header file)	PixInsight (see XISF 1.0 Specification)
XOSM	PixInsight Project File	PixInsight
XLA	Add-in macro sheet	Microsoft Excel
XLA	XLib Archive	xlibpas2.zip
XLB	Microsoft Excel Toolbar	Microsoft Excel
XLC	Microsoft Excel Chart	Microsoft Excel
XLD	Microsoft Excel Dialog	Microsoft Excel
XLF	Extensible LADAR Format	LadarSIM
XLK	Microsoft Excel Archive	Microsoft Excel
XLL	Microsoft Excel Dynamic Link Library	Microsoft Excel
XLM	Microsoft Excel Macro File	Microsoft Excel
XLR	Microsoft Works	Microsoft Works
XLS	Microsoft Excel Spreadsheet	Microsoft Excel
XLSB	Microsoft Excel 2007 Binary Workbook (BIFF12)(Spreadsheets)	Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSM	Microsoft Excel 2007 Macro-Enabled Workbook (Spreadsheets)	Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSX	Office Open XML Workbook (Spreadsheets)	Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLT	Microsoft Excel Template	Microsoft Excel
XLT	Translation table	Lotus 1-2-3 - Symphony - Procomm Plus
XLV	Microsoft Excel Module	Microsoft Excel
XLW	Microsoft Excel Workbook	Microsoft Excel
XM	FastTracker 2 extended module	AWAVE, Mod4Win, FastTracker, ImpulseTracker
XM	Music format	FastTracker 2 - Cubic Player
XMC	Assisted contact lists file format, based on xml and used in kindergartens and schools	Classmates iPhone app
XMOD	Monarch Model	Monarch Professional
XMI	Compressed eXtended MIdi music
XML	eXtensible Markup Language file
XMLT	XML Template File.
XMF	eXtensible Music Format
XMPZ	XML Miradi Project Zipfile	Miradi
XMV	video	Xbox
XNF	Standard Network File form
XNK	Microsoft Outlook	shortcut to Outlook entities
Xnn	Secondary indexes	Borland Paradox
XOF	RenderMorphics
XP	eXtended Pattern	FastTracker 2
XPL	X-Plane system file	Laminar research
XPM	X11 Pixel Map graphics file
XPO	Microsoft Dynamics AX Export file
XPS	Open XML Paper Specification / OpenXPS	open standard document format initially created by Microsoft and similar in concept to Adobe PDF files
XQT	Executable file	Waffle
XQT	Macro sheet	SuperCalc
XRM-MS	XrML Digital License	SuperCalc
XSD	XML schema description
XSF	data	Microsoft InfoPath file
XSF	data	Microsoft InfoPath file
XSPF	XML Sharable Playlist Format
XSL	XSL Stylesheet
XSLT	XSLT file
XSN	Microsoft InfoPath template	Microsoft InfoPath
XTB	External translation table	LocoScript
XTP	XTreeGold overlay	XTreeGold
XVF	Xyngo Video File	Xyngo Video Board
XWD	Xerox DocuWorks file (RTF internal?)	DocuWorks
XWD	X Window System window dump image graphics file	SDSC Image Tool
XWK	Keyboard mapping	Crosstalk
XWP	Session	Crosstalk
XWP	Text file	Xerox Writer
XX	XX-encoded file (ASCII)	XXDECODE
XXE	XX-encoded file (ASCII)	XXDECODE
XXX	Singer Embroidery Format	Embroidermodder
XY	Text file	XY Write
XY3	Text file	XYWrite III
XYW	Text file	XyWrite III
XYZ	Molecular coordinates	XMol, RasMol
XZ	a lossless data compression file format incorporating the LZMA/LZMA2 compression algorithms.	xz

Y

Ext.	Description	Used by
Y	Archive (Amiga)	Yabba
Y	YACC grammar file	Yacc/Bison
YAL	Data custom/nature.yal	Arts & Letters
YML	YML markup file	YML (domain specific language output to XML)
YAML	YAML source file	YAML (data serialization language)
YC	Archive	YACC (YAC.EXE)
YLIB	Yookoo Music Library Backup File	Yookoo Media Player
YMP	Yast Meta Package	YAST2 (SUSE Linux Package Manager)
Ynn	Secondary index	Borland Paradox
YOOKOO	Yookoo Playlist	Yookoo Media Player
YRD	Yard Tracks File	FYM
YST	Data	YASRT Raytracer scene
YUV	Graphics format (YUV)
YY	Bison grammar file	Bison
YZ	Archive	YAC

Z

Ext.	Description	Used by
Z	Archive	WinZipNT - compress - pack
Z01-Z99	Split WinRAR Archive
Z2S	Zoo Tycoon 2 saved game	Any game in the Zoo Tycoon 2 series
Z3	Infocom game module
Z3D	Zmodeler-file	Zmodeler 1 & 2
Z64	Nintendo 64 ROM	Nintendo 64 emulators
Z64	Nintendo 64 ROM	Project64 Nintendo 64 emulator
Z80	Snapshot	ZX Spectrum emulator by g.a.lunter
ZAD	ZFax digitized voice file	ZFax
ZARGO	UML model project file	ArgoUML
ZCC	Cutpath for Zund digital cutting systems	Zund Cut Center
ZDG	Compressed ZiffNet text document	Z-view
ZED	BitTorrent Link	Podmailing
ZER	Data file
ZIF	Zoomable Image Format
ZIP	Archive	PKZip - WinZip - Mac OS X
ZOO	Zoo Tycoon saved game	Any game in the Zoo Tycoon (first) series
ZS	Script for Minecraft mod MineTweaker[10] and CraftTweaker[11]	Minecraft Mods
ZTD	Zoo Tycoon data	Zoo Tycoon
ZUR	High level compressed file
ZUZ	Cost estimating file	ZUZIA ZUZIAbim
ZYP	Reason Subtractor Patch File	Propellerhead Reason
ZZT	ZZT World	Any world created using the ZZT editor

See also

• List of file formats

References

1. RFC 5334 Ogg Media types
2. "Alignment Fileformats". 22 May 2019. Retrieved 22 May 2019.
3. "t$m files - FILExt Forum". Filext.com. Retrieved 2012-06-19.
4. Tru-i Suite, truknox.com
5. "TST File - What is it and how do I open it?". file.org. Retrieved 28 April 2015.
6. "TZX File | Common 8bit tape files".
7. "Oracle VM VirtualBox User Manual, Chapter 10. Technical background". Oracle Corporation. Retrieved 28 December 2016.
8. "Oracle VM VirtualBox User Manual, Chapter 1.5. Installing VirtualBox and extension packs". Oracle Corporation. Retrieved 28 December 2016.
9. "Details of extension .wax". filedesc.com. 2012. Retrieved March 7, 2012.
10. Hebben, Stan. "Tutorial:Introduction - Minetweaker 3". minetweaker3.powerofbytes.com. Retrieved 28 September 2014.
11. "Crafttweaker Documentation". crafttweaker.readthedocs.io. Retrieved 2019-11-17.

External links

• File Extension Resource
• The File Extensions Resource
• File information site
• File format finder
• List of file types