Extensions	Programm, Beschreibung
RGB, SGI	Silicon Graphics RGB files
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
SF2	Creative Labs Soundfont 2.0 Bank file (Soundblaster)
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
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
SHTML	HTML file containing Server Side Includes (SSI)
SHW	Corel Show presentation
SIG	Signature file
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
SSD	SAS database (Dos)
SSD01	SAS data sets (Unix)
ST	Atari ST disk image
STM	Shorter suffix for .shtml, an HTML file containing a Server Side Include (SSI)
STM	Scream Tracker v2 music module (MOD) file
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
T2T	Sonata CAD modelling software file
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
UB	Raw unsigned byte (8-bit) data
UDF	Windows NT Uniqueness Database File
UDW	Raw unsigned doubleword (32-bit) data
ULAW	US telephony format (CCITT G.711) audio
ULT	Ultratracker music module (MOD) file
UNI	MikMod UniMod formatted file
URL	Internet shortcut file
USE	MKS Source Integrity file
UU	UU-encoded file
UUE	UU-encoded file
UW	Raw unsigned word (16-bit) data
UWF	UltraTracker Wave file
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
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
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
WPW	Novel PerfectWorks document
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
.X	AVS image format
X16	Macromedia Extra (program extension), 16 bit
X32	Macromedia Extra (program extension), 32 bit
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
.YAL	Arts & Letters clipart library
.YBK	Microsoft Encarta Yearbook
.Z	Unix Gzip Compressed
ZIP	Zip file Compressed archive
ZOO	An early compressed file format