# List of filename extensions (S–Z)

This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.
* 0-9
* 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
* See also
* References

## S

| Ext. | Description | Used by |
| S | assembler source code file | Unix |
| S3M | Scream Tracker Module | Scream Tracker |
| S7I | Seed7 library / include file | Seed7 interpreter and compiler |
| SAIF | Spatial Archive and Interchange Format | |
| SASS | Sass stylesheet language, indented-format | |
| SAT | ACIS ACIS .sat | |
| SAV | SPSS tabular data (binary) | PSPP, SPSS |
| SB | Scratch 1.x project | Scratch |
| SB2 | Scratch 2.0 project | Scratch |
| SB3 | Scratch 3.0 project | Scratch |
| SBH | Header | ScriptBasic |
| SBV | Superbase RDBMS form definition data | Superbase (database) |
| SBX | For experimental extensions to Scratch | Used by scratchX (scratchx.org) |
| SCALA | Scala source code file | Scala (programming language) |
| SCM | Scheme source code file | |
| SCR | Screen Protector file | Windows Screen Protector |
| SCSS | Sass stylesheet language | |
| SDF | SQL Server Compact database file | Microsoft SQL Server Compact |
| SD7 | Seed7 source file | Seed7 interpreter and compiler |
| SDNN | Encrypted Story Distiller Nursery Notes Database | Story Distiller, Series Distiller |
| 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 | |
| SEC | Secret key ring file | Pretty Good Privacy RSA System |
| SED | Self extraction directive file | IExpress |
| SEQ | Video | Tiertex video sequence |
| SERIES | Encrypted Series Distiller database | Series Distiller |
| SF | JAR Digital Signature | |
| SFB | Configuration file | emacs |
| SFH | backup file for Strike Force Heroes (SFH) on Steam | |
| SFX | SFX (self-extracting archives) script | RAR |
| SH | Unix shell script | Unix shell interpreter |
| SHAR | Shell self-extracting archive | UNSHAR (Unix) |
| SHTM | SSI-enabled HTM file | Server Side Includes |
| SHTML | SSI-enabled HTML file | Server Side Includes |
| SHX | Shape entities ESRI shapefile | AutoCAD ArcGIS |
| SIC | S.I.C.K. Source File | |
| SIG | Signature file | gpg, PopMail, ThunderByte AntiVirus |
| SL | S-Lang source code file | |
| SLDASM | SolidWorks assembly | SolidWorks |
| SLDPRT | SolidWorks part | SolidWorks |
| SM | SMALLTALK source code file | |
| SMCLVL | Secret Maryo Chronicles Level | Secret Maryo Chronicles |
| SMK | Smacker video Format (RAD Video) | |
| SNO | SNOBOL4 source code file | |
| SO | shared object, dynamically linked library | Unix, Linux |
| SPF | data | SQR Portable Format |
| SPIFF | Still Picture Interchange File Format | |
| SPIN | Spin source file | Parallax Propeller Microcontrollers |
| SPS | SPSS program file (text) | PSPP, SPSS |
| SPT | SPITBOL source code file | |
| SPV | SPIR-V binary file | Vulkan, Khronos Group |
| SPX | Ogg Speex bitstream | Xiph.Org Foundation |
| SPZ | Crestron SIMPL Windows compiled program (ZIP format) | Crestron SIMPL Windows |
| SQL | Structured Query Language | Any SQL database |
| SRT | SubRip Subtitle file | Most media players |
| SRX | Series Distiller update XML file | Series Distiller |
| SSC | Celestia Solar System Catalog file | Celestia |
| SSC | Stellarium Script | Stellarium |
| ST | SMALLTALK source code file | Little Smalltalk |
| ST | Structured text file | |
| STC | Celestia Star Catalog file | Celestia |
| STC | OpenOffice.org XML spreadsheet template | OpenOffice.org Calc |
| STD | OpenOffice.org XML drawing template | OpenOffice.org Draw |
| STEP | Standard for the Exchange of Product Data | universal format for CAD exchange per ISO 10303 |
| STI | OpenOffice.org XML presentation template | OpenOffice.org Impress |
| STK | Stockholm multiple sequence alignment | Bioinformatics tools eg HMMER, Xrate, Jalview |
| STL | surface geometry of a three-dimensional object | software by 3D Systems |
| STM | SSI-enabled HTML file | Server Side Includes |
| STO | Stockholm multiple sequence alignment | Bioinformatics tools eg HMMER, Xrate, Jalview |
| STORY | Encrypted Story Distiller database | Story Distiller |
| STP | Standard for the Exchange of Product Data | universal format for CAD exchange per ISO 10303 |
| STW | OpenOffice.org XML text document template | OpenOffice.org Writer |
| STX | Story Distiller update XML | Story Distiller |
| SUR | Surface topography (in native "SURF" format) | MountainsMap |
| SVC | Represents the ServiceHost instance hosted by Internet Information Services | Windows Communication Foundation |
| SVELTE | Svelte source code | Svelte |
| SVG | Scalable Vector Graphics | |
| SWF | Shockwave Flash | Macromedia, Adobe Flash Player |
| SWG | SWIG source code | SWIG |
| SWIFT | Swift source code | Swift (programming language) |
| SWM | split Windows Imaging Format | ImageX, DISM, 7-Zip, wimlib |
| 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 |
| SYLK | Symbolic Link (SYLK) file | Windows |
| SYMBOLICLINK | Replace file for a symbolic link | Unix-like OSs |

## T

| Ext. | Description | Used by |
| TAK | Audio codec, Lossless audio file format | Winamp (+Plugin), foobar2000 (+Plugin), Media Player Classic – BE |
| TAR | tar archive | tar and other file archivers with support |
| TAZ | tar archive compressed with compress | tar and other file archivers with support |
| TB2 | tar archive compressed with Bzip2 | tar and other file archivers with support |
| TBZ | tar archive compressed with Bzip2 | tar and other file archivers with support |
| TBZ2 | tar archive compressed with Bzip2 | tar and other file archivers with support |
| TC | Theme Colour file | Saturn CMS |
| TER | Terragen heightmap file | Terragen scenery generator |
| TGA | Truevision Advanced Raster Graphics Adapter image | |
| TGT | Target configuration file | Target active security software |
| TGZ | tar archive compressed with gzip | tar and other file archivers with support |
| THM | Thumbnail File | GoPro, Android, some versions of iOS (Accessible via computer or Jailbreak, on User/Media/PhotoData/Metadata/DCIM) |
| TIF | See TIFF | |
| TIFF | Tag Image File Format image | |
| 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. |
| TLZ | tar archive compressed with LZMA | tar and other file archivers with support |
| TMP | Temporary file | |
| TORRENT | Torrent file | BitTorrent clients (various) |
| TQL | The quest lessons | TheQuest |
| TS | MPEG transport stream | Video broadcasting, digital video cameras |
| TS | TypeScript | |
| TSCN | Godot Engine Text Scene file | Godot Engine |
| TSV | Tab-separated values | |
| TTC | TrueType Font collection | |
| TTF | TrueType Font file | |
| TWB | Tableau Software Workbook file | |
| TXT | Text file | |
| TXZ | tar archive compressed with xz | tar and other file archivers with support |
| TZ2 | Same as TBZ | tar and other file archivers with support |
| TZST | tar archive compressed with Zstandard | tar and other file archivers with support |

## U

| Ext. | Description | Used by |
| UI | Espire source code file | Geoworks UI Compiler Geos |
| UI | Qt Designer's UI File | Trolltech Qt Designer |
| UMP | Umple UML Programming Language Format | Umple |
| 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 uses it today |
| UOS | Uniform Office Format spreadsheet | |
| UOT | Uniform Office Format text | |
| UPD | Update file for Storage | |
| UPS | ROM patch file | |
| URL | Remote file shortcut | Microsoft Windows |
| USDZ | Augmented Reality (AR) File | Apple, Pixar |
| UST | Vocal synthesis track data | UTAU |
| USTX | Vocal synthesis track data | OpenUtau |
| UT! | datafile | uTorrent |
| UXF | UML Exchange Format | |

## V

| Ext. | Description | Used by |
| V | Coq source file | |
| V | Verilog source file | |
| V3 | Victoria 3 save game file | Victoria 3 |
| V4P | vvvv patch | vvvv |
| V64 | ROM image from an N64 cartridge | DoctorV64, Doctor V64 junior, Project 64 and other N64 emulators |
| VB | Visual Basic .Net source file | Visual Basic .NET |
| VBOX | virtual machine settings file (in XML format) | VirtualBox |
| VBOX-EXTPACK | VirtualBox extension package | 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 |
| VC | VeraCrypt Disk Encrypted file | Open Source VeraCrypt |
| VC6 | Graphite – 2D and 3D drafting | Ashlar-Vellum |
| VCLS | VocaListener voice scanner file | VocaListener Plug-in (Vocaloid3) |
| VDA | Targa bitmap graphics | many raster graphics editors |
| VDI | Virtual Disk Image | VirtualBox |
| VDW | Visio web drawing | Microsoft Visio |
| VDX | Visio XML drawing | Microsoft Visio |
| VFD | Virtual Floppy Disk | Windows Virtual PC (among others) |
| VI | Virtual Instrument | LabVIEW |
| VMCZ | Hyper-V Exported Virtual Machine | Microsoft |
| VMDK | Virtual Disk file | VMware |
| VMG | Nokia message file format | Text Message Editor (Nokia PC Suite) |
| VOB | Video Object | DVD-R, DVD-RW |
| VMX | virtual machine configuration file | VMware |
| VPK | Valve package | Source engine games |
| VPM | Garmin Voice Processing Module | |
| VPP | Visual Paradigm Project | Visual Paradigm for UML |
| VPR | Vocal synthesizer track data | Vocaloid 5 |
| VQM | Hardware description language | Altera |
| VRB | LateX Beamer file containing verbatim commands | LaTeX Beamer |
| VRB | Veeam reversed incremental backup archive | Veeam software |
| VS | Vellum Solids | Ashlar-Vellum |
| VSD | Visio drawing | Microsoft Visio |
| VSDX | Visio drawing | Microsoft Visio |
| VSM | Visual Simulation Model | VisSim |
| VSQ | Vocal synthesizer track data | Vocaloid 2 |
| VSQx | Vocal synthesizer track data | Vocaloid 3, Vocaloid 4 |
| VST | Truevision Vista graphics | many raster graphics editors |
| VSTO | Microsoft Office add-in file | Microsoft Visual Studio |
| VSVNBAK | VisualSVN Server repository backup | VisualSVN Server |
| VTF | Valve Texture Format file | Valve Corporation |
| VUE | Visual Understanding Environment map | Visual Understanding Environment |
| VVVVVV | VVVVVV map file | VVVVVV |

## W

| Ext. | Description | Used by |
| WAD | Default package format for Doom that contains sprites, levels, and game data | Doom and Doom II |
| WAD | Package containing Wii Channel data, such as Virtual Console games. It is commonly used in homebrew to install custom channels, and can be installed with a WAD Manager | Nintendo Wii |
| WAV | Sound format (Microsoft Windows RIFF WAVE) | Media Player |
| WEBM | Royalty-free video/audio container | HTML5 |
| WIN | Game code for GameMaker games | GameMaker |
| WITNESS_CAMPAIGN | Game save file for The Witness | The Witness |
| WK1 | Spreadsheet | Lotus 1-2-3 version 2.x – Lotus Symphony 1.1+ |
| WK3 | Spreadsheet | Lotus 1-2-3 version 3.x |
| WKS | Spreadsheet | Lotus 1-2-3 version 1A – Lotus Symphony 1.0, Microsoft Works |
| WL | Wolfram Language package | |
| WLMP | Windows Live Moviemaker Project, contains paths from where the images/audios/videos of the project are located | Windows Live Movie Maker |
| WLS | Wolfram Script | Wolfram Language |
| WMA | Windows Media Audio file Advanced Systems Format | |
| WMDB | Windows Media Player database | Windows Media Player |
| WMF | Windows MetaFile vector graphics | |
| WMV | Windows Media Video file Advanced Systems Format | |
| WOS | WoS bibliographic reference file | ISI/Clarivate Analytics |
| WPS | Wii U plugin for aroma | Aroma Environnement (Wii U) |
| WS | Whitespace programming language, WonderSwan ROM | Whitespace programming language, WonderSwan ROM |
| WSC | WonderSwan Color ROM |
| WTX | Text document | |
| WUHB | Wii U Homebrew Bundle | Aroma environnement (Wii U) |

## X

| Ext. | Description | Used by |
| X | LEX source code file | |
| X | XBasic Source code file | Xbasic |
| X3D | x3d and xdart Formats | |
| 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 |
| XBRL | eXtensible Business Reporting Language instance file | eXtensible Business Reporting Language |
| XCF | Gimp image file | GNU Image Manipulation Program |
| XDM | Directory Manipulator for 32-bit Protected Mode | Xenotech Research Labs |
| XE | Xenon – for Associative 3D Modeling | Ashlar-Vellum |
| XEX | Xbox 360 Executable File | |
| XLR | Microsoft Works spreadsheet or chart file, very similar to Microsoft Excel's XLS | 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) |
| XM | FastTracker 2 extended module | AWAVE, Mod4Win, FastTracker, ImpulseTracker |
| XML | eXtensible Markup Language file | |
| XMF | eXtensible Music Format | |
| XP | eXtended Pattern | FastTracker 2 |
| XPL | X-Plane system file | Laminar Research |
| XPS | Open XML Paper Specification / OpenXPS | Open standard document format initially created by Microsoft and similar in concept to Adobe PDF files |
| XSD | XML schema description | |
| XSF | data | Microsoft InfoPath file |
| XSL | XSL Stylesheet | |
| XSLT | XSLT file | |
| XSN | Microsoft InfoPath template | Microsoft InfoPath |
| XSPF | XML Sharable Playlist Format | |
| XX | XX-encoded file (ASCII) | XXDECODE |
| XXE | XX-encoded file (ASCII) | XXDECODE |
| XXX | Singer Embroidery Format | Embroidermodder |
| 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 | YACC grammar file | Yacc/Bison |
| YML | YML markup file | domain specific language output to XML |
| YAML | YAML source file | YAML (data serialization language) |

## Z

| Ext. | Description | Used by |
| ZIP | ZIP (file format) | PKZip – WinZip – Mac OS X |
| ZRX | REXX scripting language for ZOC_(software) | ZOC terminal emulator |
| ZS | Script for Minecraft mod MineTweaker and CraftTweaker | Minecraft Mods |
| ZST | ZStandard, a lossless data compression file format. | zstd |