| .s | Source Code Format |
| .s#+a | RagTime 2 |
| .s00 | Split Multi-volume ZipSplitter Compressed File Archive (part 1) |
| .s01 | Corel WordPerfect Distribution Format |
| .s02 | Corel WordPerfect Distribution Format |
| .s03 | Corel WordPerfect Distribution |
| .s04 | Split Multi-volume ZipSplitter Compressed File Archive (part 5) |
| .s05 | Split Multi-volume ZipSplitter Compressed File Archive (part 6) |
| .s06 | Split Multi-volume ZipSplitter Compressed File Archive (part 7) |
| .s07 | Split Multi-volume ZipSplitter Compressed File Archive (part 8) |
| .s08 | Split Multi-volume ZipSplitter Compressed File Archive (part 9) |
| .s09 | Split Multi-volume ZipSplitter Compressed File Archive (part 10) |
| .s10 | Brasfoot Saved Game Format |
| .s19 | Motorola EEPROM Programming Format |
| .s1j | Sealed |
| .s1p | Touchstone 1 S-parameter Data |
| .s2 | Stranded II Map |
| .s28 | Genesis Or Sega32X ROM Image |
| .s2a | SEAL Program Format |
| .s2d | Agilent EEsof EDA S-parameter Data |
| .s2e | SWF To EXE Converter Project Format |
| .s2k | Subtitle |
| .s2m | Stronghold 2 Map Format |
| .s2ma | Starcraft 2 Map |
| .s2mh | StarCraft 2 Map Header Format |
| .s2mi | Starcraft 2 Cache |
| .s2ml | StarCraft 2 Map Localization Format |
| .s2mv | Starcraft 2 Map Preview Image |
| .s2p | Touchstone 4 S-parameters Data |
| .s2qh | StarCraft 2 Localisation Header Format |
| .s2ql | StarCraft 2 Unit Localisation Format |
| .s2s | Spike2 Script |
| .s2t | Scia2Tekla Plugin |
| .s2z | S2Games Savage Game Format |
| .s31 | SmartWhois |
| .s3d | Philips 3D Solutions 3D Displays That Show 3D Content |
| .s3db | MySQL Database |
| .s3i | ScreamTracker V3 Instrument Format |
| .s3m | Scream Tracker V3 Module |
| .s3p | Touchstone 9 S-parameters Data |
| .s3t | Scorched 3D Tankpack |
| .s3z | Amiga And Pc Tracker Module Format |
| .s43 | IAR Assembly Source |
| .s4e | Airplay SDK Header |
| .s4m | SWAT 4 Map Format |
| .s4p | Touchstone 16 S-parameters Data |
| .s57 | International Hydrographic Organization Vector Image |
| .s5x | Heritage Of Kings: The Settlers Map Format |
| .s6bn | Word 6 For Mac Template |
| .s7 | Sibelius Music Notation |
| .s7p | SubSeven Trojan |
| .s7z | 7-zip Compressed Format |
| .s85 | SABRE StaffPlan Chart Format |
| .s8bn | Word 98 For Mac Template |
| .s8l | SAP GUI |
| .s98 | NEC PC-98 Audio |
| .sa1 | Nintendo Game Boy Emulator Save Format |
| .sa2 | Suprise! Adlib Tracker Music Module |
| .sa4 | Delorme Street Atlas USA |
| .sa5 | SecretAgent Archive |
| .sa7 | Street Atlas Map Document |
| .sa8 | Street Atlas 8 Map Document |
| .sa9 | Hue And Cry Adobe Photoshop Plug-in Format |
| .saa | SecretAgent Encrypted Archive |
| .saas | Sass Indented Syntax |
| .sab | 3D ACIS Binary Format |
| .sab2 | NVision 3D Scanner |
| .sabl | Call Ot Duty: Black Ops II Audio Library |
| .sabs | Call Ot Duty: Black Ops II Sounds |
| .sacred2save | Sacred 2 Save Game |
| .sad | Lucas Arts Sound Format |
| .saf | Street Atlas USA Map Format |
| .safariextz | Apple Safari Extension Format |
| .safe | WM Keeper CLASSIC Purse File Backup |
| .safetext | Encrypted Text |
| .sah | Seti@home Data |
| .sai | PaintTool SAI Image |
| .saj | Sage 50 Folder |
| .sak | Postal Game Archive |
| .sal | SQL Application Language |
| .sam | Ami Pro Document Format |
| .sam07 | SAM 2007 Package Format |
| .samba3 | Gnome Desktop |
| .sami | Synchronized Accessible Media Interchange Format Format |
| .samrc | SAM Default Parameters |
| .san | LucasArts Smush Animation Format |
| .sap | Atari XL/XE Audio Format |
| .sapssd | SAP Related |
| .sar | SAR Compressed Format Archive (SAPCAR Archive) |
| .sas | SAS Source Code Format |
| .sas7bdat | SAS Database |
| .sas7bndx | SAS Index |
| .sass | Syntactically Awesome Stylesheets Indented Syntax |
| .sat | 3D ACIS Model Format |
| .sav | Saved Game Format |
| .sav2 | SuperPower Save Game |
| .save | Nano Temporary Saved Format |
| .saveddeck | Nokia Saved Web Page Format |
| .savedsearch | Spotlight Saved Search |
| .savedstate | Virtual Router Saved State Format |
| .saver | Mac OS X Screen Saver |
| .save_multiplayer | Total War Multiplayer Save |
| .savf | AS400Manager JAVA |
| .saw | Living Scenes Jigsaw Puzzles |
| .sax | Sedona Framework XML Application |
| .say | Saya Matrix Accounting Database |
| .saz | Fiddler Session Archive ZIP |
| .sb | Scratch Finished Product Format |
| .sb1 | MemoryMixer Album |
| .sb7 | SetupBuilder Project |
| .sba | SpeedBalance Accounting Data |
| .sbb | Microsoft Office Accounting Company Backup Format |
| .sbc | Microsoft Office Accounting Company Shortcut Format |
| .sbd | Mozilla Mail Subdirectory Format |
| .sbe | Spybot Excludes |
| .sbf | Google Android Mobile Phone Backup Format |
| .sbg | SBaGen Binaural Beat Format |
| .sbi | Creative Labs SoundBlaster Instrument |
| .sbk | Creative Labs EMU SoundFont V1 Bank Format |
| .sbl | Arquitienda Graphic Symbol Library |
| .sbml | Systems Biology Markup Language Source |
| .sbn | ArcView Spatial Index For Read-write Shapefiles |
| .sbo | SAP Business One SDK Add-on Related |
| .sbp | OpenSBP CNC Program Format |
| .sbproj | OpenGL Shader Builder Project |
| .sbq | Superbase Query Definition Format |
| .sbr | Microsoft Visual Studio Visual C++ Source Browser Intermediate Format |
| .sbrz | Sky Ebook Reader E-book |
| .sbs | Spybot Search And Destroy Includes Format |
| .sbsc | Adobe Soundbooth Score Document |
| .sbst | Adobe Soundbooth Score Template |
| .sbstore | Mozilla Firefox |
| .sbt | Suberbase Record Notes Format |
| .sbu | Samsung Kies Backup |
| .sbv | Superbase Form Definition Format |
| .sbw | US Treasury Savings Bonds Wizard Format |
| .sbx | Adobe Illustrator Tsume Format |
| .sbz | ShowBiz Project |
| .sc | Framework II Display Driver |
| .sc1 | SimCity |
| .sc2 | Sample Cell II PC/Mac Instrument Format |
| .sc2000 | Sim City 2000 Tileset |
| .sc2archive | StarCraft 2 Archive Format |
| .sc2assets | StarCraft 2 Game Assets Format |
| .sc2bank | StarCraft 2 Bank Format |
| .sc2data | Starcraft 2 A.I. Game Format |
| .sc2locale | StarCraft 2 Localization Format |
| .sc2ma | StarCraft 2 Map Data Format |
| .sc2map | StarCraft 2 Map Format |
| .sc2mod | StarCraft 2 Game Mod Format |
| .sc2replay | Starcraft 2 Game Replay Format |
| .sc2save | StarCraft 2 Game Saved Format |
| .sc2scene | StarCraft 2 Cut Scene Format |
| .sc3 | Renamed DBASE III Screen Mask Format |
| .sc4 | Game File Format |
| .sc45 | SuperCard Project Format |
| .sc4desc | SimCity 4 Description Format |
| .sc4lot | SimCity 4 Lot Format |
| .sc4model | SimCity 4 Model Format |
| .sc5 | Chris Sawyer Locomotion Scenario |
| .sc6 | RollerCoaster Tycoon 2 Scenario Format |
| .sc? | ColoRix Bitmap Image |
| .sca | Scala InfoChannel Script Format |
| .scacfg | SuperCard Application Configuration Format |
| .scad | OpenSCAD CAD Model Format |
| .scala | Scala Source |
| .scap | EFI Firmware Format |
| .scar | SCAR Script Format |
| .scat | RealView Scatter-loading |
| .scb | Command & Conquer World Builder Script Format |
| .scc | Visual SourceSafe Control Format |
| .scd | Scribus Document Format |
| .scdoc | SpaceClaim 3D CAD |
| .sce | SoftCuisine Data Exchange |
| .scea | Marathon 2 Aleph One Map Format |
| .scene | VCollab Scene Format |
| .scexcludb | Spring Cleaning Exclusions Format |
| .scf | Windows Explorer Shell Command Format |
| .scg | MyPM SCG Definition Format |
| .sch | CAD Schematics Format |
| .schdoc | Altium Designer Schematic Capture Binary |
| .schemas | GConf Schema Definition Format |
| .schematic | MCEdit Schematic Format |
| .scheme | Sothink Logo Maker Color Scheme |
| .sci | Virtumonde / Vundo Trojan Infected Format |
| .scl | Scala Scale |
| .scm | StarCraft Campaign Map Format |
| .scmt | GXS Application Integrator XML Constraint |
| .scn | Game Scenario Format |
| .sco | Game Score Format |
| .sconscript | SCons SConscript Configuration |
| .sconstruct | SCons Makefile |
| .score | Learning Score |
| .scp | ColoRix Bitmap Image |
| .scpcfg | SuperCard Project Configuration Format |
| .scprt | Surfcam 3D Format |
| .scpt | AppleScript Script Format |
| .scptd | AppleScript Script Bundle |
| .scq | SAS Sequential Access |
| .scr | Microsoft Windows Screensaver Format |
| .scrabblehasbrosavedgame | Hasbro Scrabble Save Game |
| .scratch | Scratch Finished Product Format |
| .screem | SCREEM |
| .screenflow | ScreenFlow Document |
| .screstorelog | Spring Cleaning Restore Log Format |
| .scresults | Spring Cleaning Results Format |
| .script | Generic Script Format |
| .script editor | Apple Mac OS X AppleScript Script |
| .scriptsuite | AppleScript Script Suite Format |
| .scriptterminology | AppleScript Script Terminology Format |
| .scriv | Literature & Latte Scrivener Document Format |
| .scrivx | Literature & Latte Scrivener Document Format |
| .scro | Amira Script Object |
| .scs | SimCity Societies Saved Game Format |
| .scs11 | Show Cue System Cue Format |
| .scspack | SimCity Societies Transfer Package |
| .scss | Syntactically Awesome Stylesheets Syntax |
| .sct | Microsoft Windows Script Component Format |
| .scu | ColoRix Bitmap Image |
| .scut2 | Sure Cuts A Lot |
| .scv | ScanVec CASmate Sign Format |
| .scvinfo | Windows Communication Foundation WCF Metadata |
| .scw | Movie Magic Screenwriter Document Format |
| .scx | ColoRix Bitmap Image |
| .scy | ReaGeniX Security |
| .scz | Wingz Script Format |
| .sd | Audio Format |
| .sd0 | Dali Raw Image |
| .sd1 | Dali Raw Image |
| .sd2 | Sound Designer 2 Format |
| .sd2f | Sound Designer 2 Format |
| .sd3 | Hy-Tek Meet Manager Database Related |
| .sd4 | Smart Diary Suite Database |
| .sd7 | Spring RTS Engine Data Format |
| .sda | StarOffice Drawing Format |
| .sdat | Nintendo DS Sound Data Format |
| .sdb | OpenOffice Base Database Format |
| .sdbn | Microsoft Word 4/5 For Mac Template |
| .sdbz | Symantec Support Tool Information |
| .sdc | OpenOffice.org Spreadsheet Format |
| .sdd | OpenOffice.org Impress Presentation Format |
| .sde | Drumbeat Exported Data |
| .sdef | AppleScript Dictionary Scripting Definition |
| .sdexp | Creo Elements/Direct Model |
| .sdf | SQL Server Compact Edition Database Format |
| .sdfa | Exocad 3D |
| .sdg | StarOffice Gallery Image Format |
| .sdi | System Deployment Image Format |
| .sdif | Sound Description Interchange Format |
| .sdii | Sound Designer 2 Audio Format |
| .sdinstall | Speckie Dictionary Format |
| .sdir | Apple Logic Space Designer Impulse Response |
| .SDIRproj | Apple Impulse Response Utility Project |
| .sdk | Roland S-550/S-50/W-30 Disk Image |
| .sdkmesh | Microsoft DirectX Vertex Mesh |
| .sdl | Corel Paradox Script Format |
| .sdlprofile | TRADOS Exported User Settings |
| .sdltm | SDL Trados Studio |
| .sdlxliff | SDL Trados Studio Format |
| .sdm | StarOffice Mail Format |
| .sdmdocument | Microsoft SDM Document |
| .sdn | Smart Diary Suite Ingredients Format |
| .sdnf | Steel Detailing Neutral Format |
| .sdo | Signere.no Signed Document |
| .sdoc | Microsoft Word Sealed Document Format |
| .sdp | OpenOffice.org Presentation Format |
| .sdpc | Cocreate SolidDesigner Data |
| .sdpx | Kodak Cineon Image Format |
| .sdq | SAS Data Format |
| .sdr | SmartDraw Drawing Format |
| .sdr2 | H.264 MICRO DVR Camera Movie |
| .sds | OpenOffice.org Chart Format |
| .sdsk | SafeHouse Private Storage Volume Format |
| .sdt | SmartDraw Template Format |
| .sdv | Pinnacle Studio DV Video Editing Project |
| .sdw | OpenOffice.org Text Document Format |
| .sdx | Sample Sound Format |
| .sdy | StarMoney |
| .sdz | Spring RTS Engine Data Format |
| .se | SEwin Project |
| .se1 | CT Summation IBlaze Database |
| .sea | StuffIt Expander Archive Format |
| .seam | Seam Framework Java Servlet Format |
| .search-ms | Microsoft Windows Index Search Data Format |
| .searchconnector-ms | Microsoft Windows Search Connector Description Format |
| .searchindexcache | Mac OS X Cache |
| .sec | Pretty Good Privacy Secret Key Ring Format |
| .secstore | Adobe Secstore |
| .secure | Septium Secured Document |
| .securedownload | Safari Download |
| .security | Javasoft Jre 1.3 Lib Security |
| .securitysettings | Alpha Five Security Settings |
| .sed | Self Extracting Directive Format |
| .sedprj | Ashampoo Slideshow Studio Project Format |
| .see | LISCAD Plus |
| .seed | Linux Preseed Format |
| .seek | Word List Expert Seek List |
| .seestyle | Coda For Mac Style Sheet Format |
| .sef | Steganos Encrypted Format |
| .seg | Eragon Audio Format |
| .seg1 | StuffIt Segment |
| .seg2 | Stuffit Mac File Type |
| .seg3 | StuffIt Segment |
| .segn | StuffIt Segment |
| .SEGY | SEG-Y Geophysical Data |
| .sel | Corel PaintShop Photo Pro Selection Format |
| .sem | Alpha Five Set Objects |
| .seman | Xtext Semantics |
| .sen | Scifer Archiver Internal Archive Format |
| .seo | SEO Note Format |
| .sep | ChemSep Separation Case Format |
| .seplugin | Apple Mac OS X AppleScript Editor Plugin Format |
| .seq | Power Tracks Pro Music Sequencer Format |
| .sequ | Adobe Acrobat Sequence Format |
| .sequencediagram | Microsoft Visual Studio Sequence Diagram |
| .ser | GeneMapper Project Format |
| .server | Bonobo Activation API |
| .serverdef | Server Definition |
| .ServerStyle | ESRI ServerStyle |
| .service | Mac OS X Service Application |
| .ses | Adobe Audition Session Format |
| .session | CATIA V4 Session Format |
| .sesx | Adobe Audition Audio Session Format |
| .set | Microsoft Backup File Set |
| .settingcontent-ms | Microsoft Windows 8.1 Configuration |
| .settings | Microsoft Visual Studio Settings Format |
| .setup | CryENGINE Character Format |
| .sev | SevenUp Picture |
| .sew | Janome Sewing Machine Stitch Format |
| .sex | Alpha Five Set Index |
| .sf | IRCAM / MTU SoundFile Format |
| .sf0 | Windows Sytem Check |
| .sf2 | Creative Labs SoundFont 2.0 Bank Format |
| .sf3 | STATGRAPHICS Data |
| .sf7 | Sega SF-7000 ROM |
| .sfa | Sony Sound Forge |
| .sfap0 | Sony Sound Forge Proxy Format |
| .sfar | Mass Effect 3 DLC Add-on Format |
| .sfark | Melody Machine Compressed SoundFont |
| .sfb | Sony Playstation 3 Game Disc Description Format |
| .sfc | Nintendo SNES9x ROM Format |
| .sfcache | ReadyBoost Cache Format |
| .sfd | SoundStage Sound Data Format |
| .sff | Structured Fax Format Image Format |
| .sfi | Corel Ventura Publisher HP LaserJet Printer Font |
| .sfil | Macintosh System Sound |
| .sfk | Sound Forge Audio Peak Format |
| .sfl | Sony Sound Forge Sound Data Format |
| .sfm | Dart PRO Soundtree Structure |
| .sfn | EasySIGN Font |
| .sfo | CuteFTP Search Format |
| .sfp | Soft Font Printer Format |
| .sfpack | SFPack Compressed Soundfont Format |
| .sfr | Sonic Foundry Sample Resource |
| .sfs | Squashfs Format |
| .sft | Microsoft App-V Sequencer Format |
| .sfv | Simple File Verification Checksum Format |
| .sfvidcap | Sony Vegas Video Capture Format |
| .sfw | Seattle Film Works Graphics Format |
| .sfx | Self-extracting Compressed Archive Format |
| .sfz | SoundFont Compressed Audio |
| .sg | SnapGraphix User |
| .sg2 | Band-in-a-Box Audio |
| .sg3 | ChessDB Game |
| .sg4 | Band-in-a-Box Song |
| .sga | Relic Entertainment SGA Archive Format |
| .sgaa | Aleph One Marathon 2 Save Game Format |
| .sgb | Warhammer 40K Dawn Of War Map Format |
| .sgcpo | Case CATalyst |
| .sgd | SameGame Data |
| .sgf | StarOffice Document With Graphics |
| .sgh | Guitar Hero 3 Setlist Settings |
| .sgi | Silicon Graphics RGB Bitmap Image |
| .sgl | OpenOffice.org/StarOffice Master Document |
| .sgm | Visual Boy Advance Saved State Format |
| .sgml | Standard Generalized Markup Language Format |
| .sgn | Sierra Print Artist Sign Format |
| .sgngl | Case CATalyst |
| .sgo | ECU Update |
| .sgp | STATGRAPHICS Plus Statistics Format |
| .sgr | SGR Genome Data Format |
| .sgstn | Case CATalyst |
| .sgt | Microsoft DirectMusic Producer Segments Format |
| .sgu | Band-in-a-Box MIDI |
| .sgv | StarOffice StarDraw 2.0 Picture Image |
| .sgw | N-Track Studio Packed Song |
| .sgx | IBM Rational XDE |
| .sgz | Sigza’s SigzaLock Encrypted Format |
| .sh | Unix Bourne Shell (Bash) Format |
| .sh2 | Stronghold 2 Saved Game Format |
| .sh3 | Harvard Graphics 3.0 Presentation |
| .sh3d | Sweet Home 3D Design Format |
| .sh3f | Sweet Home 3D Model Library Format |
| .sha | Unix SHAR Archive |
| .sha1 | SHA-1 Hash Text Format |
| .sha256 | FileVerifier++ SHA-256 Hashes Format |
| .sha512 | SHA512 Hash Text Format |
| .shader | Quake 3 Arena Id Tech 3 Game Engine Shader Format |
| .shadercache | Space Marine Shader Cache |
| .shaderlib | Stronghold 3 Shader |
| .shadow | FontTwister Shadow |
| .shadowIndexCompactDirectory | Mac OS X Spotlight |
| .shadowIndexGroups | Mac OS X Spotlight |
| .shadowIndexTermIds | Mac OS X Spotlight |
| .shape | Dia Diagram Editor Shape |
| .shar | Unix Self Extracting Bourne Shell Archive Format |
| .shb | Microsoft Windows Shortcut Into A Document |
| .shc | Adobe Photoshop Contours |
| .shd | Microsoft Windows Shadow Spooler Format |
| .shdc | ArmA: Armed Assault |
| .she | Medusa 2D CAD |
| .sheet | Dia Sheet |
| .shf | Pretty Good Privacy (PGP) Share |
| .shft | Shift Work Calendar |
| .shg | Segmented Hypergraphics Bitmap Format |
| .shh | Adobe Photoshop Shadow Or Highlight Settings Format |
| .shipsection | Sword Of The Stars Ship Data |
| .shit | Bourne Shell Server Page |
| .shk | ShrinkIt Compressed Apple II File Archive |
| .shlb | Mozilla |
| .shm | Corel WordPerfect Shell Macro Library |
| .shmap | Stronghold 3 Map |
| .shn | Shorten Compressed Audio Format |
| .sho | Show Pro Show Flow |
| .shortcut | Asutype Shortcut Format |
| .show | Hancom Office Hanshow Presentation Format |
| .shp | ESRI ArcView Shape Format |
| .shpa | Marathon 2 Aleph One Shape Format |
| .shr | Unix Shell Archive Format |
| .shs | Microsoft Windows 95/98 Clipboard Format |
| .shsh | Apple IPhone ECID SHSH Format |
| .sht | HTML Server Side Include Format |
| .shtm | HTML Server Side Include Format |
| .shtml | HTML Server Side Include Format |
| .shutdownStall | Mac OS X Log |
| .shv | Husqvarna Viking Designer 1 Sewing Machine Embroidery Design Format |
| .shw | Corel Presentations Slide Show |
| .shx | AutoCAD Shape Compiled Format |
| .shy | ShyFile Encrypted Format |
| .si | AutoDesk Softimage Image Format |
| .sia | Silo 3D Model |
| .sib | Sibelius Music Notation Format |
| .sic | Quicken 2002 Order |
| .sid | LizardTech MrSID Image File Format |
| .sidb | ITunes Authorization Data Format |
| .sidd | ITunes Authorization Data Format |
| .sidn | Apple ITunes Authorization Data |
| .sidx | SharpMap Spatial Index Format |
| .sif | Microsoft Windows NT Setup Installation Format |
| .sig | Microsoft Office OneNote Signature Format |
| .sign | GNU Privacy Guard |
| .signed | Apple Safari |
| .sik | Microsoft Word Backup |
| .sil | SmartInspect Log |
| .silk | Microsoft Excel Symbolic Link Format |
| .silo | VisIt Hydrodynamical Numerical Simulation Data |
| .sim | Intel VTune Performance Monitor Format |
| .sim3 | The Sims 3 |
| .simg | Synclavier Disk Image Format |
| .simple | Simple Compiler Source Code |
| .sims2pack | The Sims 2 Package Format |
| .sims2skin | Sims 2 Skin |
| .sims3 | The Sims 3 Save |
| .sims3pack | The Sims 3 Game Package Format |
| .sin | SiN Game |
| .sinf | Apple IOS Digital Rights Management |
| .sip | Scopetrax Compressed Sample |
| .sir | Bitmap |
| .sis | Symbian Installation Format |
| .sis.dm | Nokia Ovi Store Protected Program Format |
| .sisx | Symbian OS Program Installation Executable Format |
| .sisx.dm | Nokia Ovi Store Protected Program Format |
| .sit | StuffIt Expander Archive Format |
| .sit! | StuffIt Expander Archive Format |
| .sit5 | StuffIt 5 Archive Format |
| .sitd | StuffIt Archive |
| .site | Adobe GoLive Site Specific Format |
| .sitemap | ASP .NET Site Map |
| .sites | Apple IWeb Domain Format |
| .sites2 | Apple IWeb Domain Format |
| .sithqx | StuffIt Compressed Archive |
| .sitl | StuffIt Library |
| .sito | StuffIt Translator |
| .sitx | StuffIt Archive Format |
| .siv | Silicon Imaging Video Format |
| .siz | Oracle 7 Configuration |
| .sj1 | SEGA SJ-1 DIGIO Image |
| .sjava | Synchronous Java Source Code Format |
| .sjc | Sothink JavaScript Web Scroller Definition |
| .sjd | Scrapbook Factory Deluxe Saved Journal Format |
| .sjpg | Sealed JPG |
| .sjs | Simcity 3000 Buildings Add-on |
| .sj_ | SuperJAM Audio |
| .sk | Safari Saved Browsing History Format |
| .sk1 | SK1 Vector Drawing Format |
| .sk2 | ACD/ChemSketch Drawing Format |
| .ska | Happy99 Virus |
| .skb | SketchUp Backup Format |
| .skc | SideKick For Windows Database Format |
| .skcard | Starfish Sidekick Card Format |
| .skd | Autodesk Autosketch Drawing Database |
| .ske | Battlefield Skeleton |
| .sketch | Sketch Drawing |
| .skf | Autodesk AutoSKETCH Thumbnail Format |
| .skg | Skrooge Data |
| .ski | Motorola Mobile Phone Skin Format |
| .skim | Skim Notes Format |
| .skin | Skin Format |
| .skindex | Apple Mail Index Format |
| .skinnedmesh | Battlefield Skinned Mesh |
| .skitch | Skitch Graphics Format |
| .skk | SmartSketch Drawing |
| .skl | Adobe Authorware Resource Format |
| .skm | SketchUp Materials Format |
| .skn | Skin Format |
| .sko | Sage Accounting Executable |
| .skp | SketchUp Graphic File Format |
| .skr | PGP Pretty Good Privacy Private Keyring Format |
| .sks | Show.kit Template |
| .skse | The Elder Scrolls V: Skyrim Script Extender Data |
| .skt | SSEYO Koan |
| .SkuDef | Command & Conquer Archive Description Package |
| .skv | Semicolon Separated Values Format |
| .skx | XLANG Schedule Format |
| .sky | Microsoft Multiplan SYLK Spreadsheet |
| .skypechatstyle | Skype Chat Style Format |
| .skypeemoticonset | Skype Emoticon Set Format |
| .skz | SuperKaramba Theme Format |
| .sl | Unix Software License Format |
| .sl00 | HLSW Game Server Tool |
| .sl01 | HLSW Game Server Tool |
| .sl02 | HLSW Game Server Tool |
| .sl03 | HLSW Game Server Tool |
| .sl05 | HLSW Game Server Tool |
| .sl06 | HLSW Game Server Tool |
| .sl07 | HLSW Game Server Tool |
| .sl08 | HLSW Game Server Tool |
| .sl09 | HLSW Game Server Tool |
| .sl10 | HLSW Game Server Tool |
| .sl11 | HLSW Game Server Tool |
| .sl12 | HLSW Game Server Tool |
| .sl13 | HLSW Game Server Tool |
| .sl14 | HLSW Game Server Tool |
| .sl15 | HLSW Game Server Tool |
| .sl16 | HLSW Game Server Tool |
| .sl17 | HLSW Game Server Tool |
| .sl18 | HLSW Game Server Tool |
| .sl19 | HLSW Game Server Tool |
| .sl20 | HLSW Game Server Tool |
| .sl21 | HLSW Game Server Tool |
| .sl23 | HLSW Game Server Tool |
| .sl24 | HLSW Game Server Tool |
| .sl25 | HLSW Game Server Tool |
| .sl26 | HLSW Game Server Tool |
| .sl27 | HLSW Game Server Tool |
| .sl28 | HLSW Game Server Tool |
| .sl29 | HLSW Game Server Tool |
| .sl30 | HLSW Game Server Tool |
| .sla | Scribus Document Format |
| .sla.gz | Scribus Compressed Document |
| .slackbuild | Slackware Linux Script |
| .slb | PSpice Symbols Library Format |
| .slc | 3D Systems SLiCe Format |
| .sld | Autodesk AutoCAD Slide Format |
| .sld3 | Microsoft PowerPoint 3/4 For Mac Slide |
| .sld8 | Microsoft PowerPoint 98 For Mac Slide |
| .sldasm | SolidWorks Assembly Format |
| .sldblk | SolidWorks Blocks |
| .sldbombt | SolidWorks BOM Template |
| .sldclr | SolidWorks Colour Palette |
| .slddrt | SolidWorks General Table Template Format |
| .slddrw | SolidWorks Drawing Format |
| .slddwg | SolidWorks Drawing 2D Vector Graphics |
| .sldgtolfvt | SolidWorks Geometric Tolerance Style |
| .sldholtbt | SolidWorks Hole Table Template |
| .sldlfp | SolidWorks Library Part |
| .sldm | Microsoft PowerPoint 2007/2010 Macro-enabled Open XML Slide |
| .sldmat | SolidWorks Material Database |
| .sldprt | SolidWorks Part Format |
| .sldreg | SolidWorks Settings |
| .sldrevtbt | SolidWorks Revision Table Template |
| .slds | Microsoft PowerPoint 2 For Mac Slide |
| .sldsffvt | SolidWorks Surface Finish Style |
| .sldstd | SolidWorks Drafting Standard |
| .sldtbt | SolidWorks General Table Template |
| .sldtm | SDL Translation Memory Format |
| .sldweldfvt | SolidWorks Weld Style |
| .sldwldtbt | SolidWorks Weldment Cutlist Template |
| .sldx | Microsoft PowerPoint 2007/2010 Open XML Slide |
| .sle | Sisulizer Exchange Format |
| .slf | Symantec License Format |
| .slg | Chromeleon Audit Trail |
| .sli | ENVI Spectral Library |
| .slib | Synopsys Interface Timing Specification Model |
| .slidesaver | Mac OS X Screensaver |
| .slife | Slife Database |
| .slim | Slim Script |
| .slip | CodeGear Licence |
| .slk | Microsoft Symbolic Link Format |
| .sll | Static Link Library |
| .slm | Second Life Mesh Asset |
| .sln | Microsoft Visual Studio Solution Format |
| .slnk | SAP Business All-in-One Extension |
| .slo | RenderMan Compiled |
| .slogo | StarLogo Programming Project Format |
| .slogt | StarLogo Template Format |
| .slp | SpectraLayers Pro Audio Project Format |
| .slr | ArcSWAT Solar Radiation Input |
| .sls | Image Playlist Format |
| .sls3 | Microsoft Excel 3 For Mac Template |
| .sls4 | Microsoft Excel 4 For Mac Template |
| .sls5 | Microsoft Excel 5 For Mac Template |
| .sls8 | Microsoft Excel 98 For Mac Template |
| .slst | Game Data Format |
| .slt | Mozilla Firefox/Thunderbird User Profile Folder Format |
| .sltng | StarLogo TNG Project Format |
| .slupkg-ms | XrML Digital License Package |
| .slv | Silva Import And Export |
| .slw | Settler LITE Data |
| .slx | SpectraLayers Pro Audio Project Format |
| .sly | Lilypond Guitar |
| .slz | Adobe RoboHelp Screen Layout |
| .sm | ScriptMaker Script Format |
| .sm2 | RHK Technology Proprietary |
| .sm3 | DataCAD Symbol |
| .sm4 | RHK Technology Proprietary |
| .sma | AMX Mod Plugin Source Format |
| .smaf | SMAF Synthetic Music Mobile Application Format |
| .smali | Google Android Smali Assembly Language Developer Format |
| .smb | Autodesk Symbol Library |
| .smbp | Mobipocket EBook Secured Auxiliary |
| .smc | Super Nintendo Game-console ROM Image |
| .smcl | Stata Log |
| .smd | Sega Genesis ROM Emulator Format |
| .smdl | SQL Server Updated Model |
| .sme | SmartEncryptor Encrypted Archive |
| .smf | Standard MIDI File Format |
| .smh | Sealed MHT Document |
| .smht | Sealed MHT Archive |
| .smi | Microsoft SAMI Subtitles Format |
| .smil | Synchronized Multimedia Integration Language Format |
| .smk | RAD Video Tools Smacker Compressed Video |
| .sml | SMIL Slideshow Presentation |
| .smm | Samsung Galaxy S Memo Exported Format |
| .smo | Sumotori Dreams Level Format |
| .smol | Spartan Molecule Data |
| .smp | Autodesk Sampled Station List Format |
| .smpak | SuperMemo UX |
| .smpd | Sc2gears Mouse Print Data Format |
| .smpf | Sprite Monkey Project |
| .smpo | Scalado SpeedView Meta Object |
| .smprf | System Mechanic Microsoft Windows Startup Profile |
| .smps | LINDO API |
| .smpx | Finale Accompaniment |
| .smr | Smedge2 Job Settings |
| .smrd | Adobe InDesign Format |
| .sms | Sony Ericsson Exported SMS Format |
| .smst | Adobe Soundbooth Music Score Toolkit |
| .smt | Samsung Mobile Phone Theme Format |
| .smtmp | Trojan:Win32/FakeSysdef Folder |
| .smv | VideoLink Saved Mail Video |
| .smw | SIMPL Windows Source |
| .smwt | Adobe InDesign Filter Format |
| .smx | Rational XDE |
| .smz | IBM SPSS Graphboard Template Chooser Shape Format Format |
| .smzip | StepMania Package Format |
| .sn | Sound Club Editor Compressed Song |
| .sn1 | Drive Snapshot First Differential Backup Format |
| .sn2 | Drive SnapShot Partial Disk Image Format |
| .sn4 | Drive SnapShot Partial Disk Image |
| .sna | ZX80 Spectrum Mirage Emulator Snapshot Format |
| .snag | SnagIt Capture Format |
| .snagitstamps | SnagIt Archive |
| .snagproj | SnagIt Project Format |
| .snagstyles | SnagIt Style |
| .snap | ZX Spectrum Emulator Mirage Microdrive Snapshot |
| .snapdoc | Ashampoo Snap |
| .snapfireproject | Corel Snapfire Project |
| .snapfireshow | Corel Snapfire Show Format |
| .snapshot | ZX Spectrum Emulator Mirage Microdrive Snapshot Format |
| .snapx | Snapform XML Form |
| .snb | Shanda Bambook EBook |
| .snc | ACT! E-mail/folder Synchronization |
| .snd | Sound Format |
| .snda | Marathon 2 Aleph One Sound Format |
| .sndclipping | Apple Mac OS X Finder Sound Clip |
| .sndh | Atari ST Audio |
| .sndr | Sounder Sound |
| .sndt | Sndtool Sound |
| .snf | Starry Night Document |
| .sng | Song Format |
| .sngw | Devil May Cry 4 Audio |
| .sni | MDK Game Archive |
| .snippet | Microsoft Visual Studio Code Snippet Format |
| .snk | Microsoft Visual Studio Strong Name Key Format |
| .snm | Netscape Communicator E-Mail Or News Messages Index Format |
| .snoop | Sun SNOOP Capture |
| .snp | Microsoft Access Report Shapshot Format |
| .snr | Mail.Dat Seed Name |
| .sns | Save-N-Sync Backup Project Format |
| .snsf | SNES Audio Format |
| .snt | Microsoft Windows Sticky Notes Data Format |
| .snu | AVG Anti-Virus |
| .snw | Sweave Source |
| .snx | Starcraft Saved Game |
| .so | ELF Shared Library Format |
| .so-abi | AbiWord Plug-in Format |
| .so.0 | Unix Shared Library Format |
| .soa | Sage MAS 90 Accounting Software Data |
| .soap | Simple Object Access Protocol Message (SOAP) Message |
| .sob | OpenOffice.org Impress Bimap Styles Format |
| .soc | Colour Palettes And Various Style Elements |
| .socialphonebook | Sony Xperia Google Android Contact |
| .sod | Wolfenstein 3D Spear Of Destiny Game Data |
| .soe | Star Wars Shadows Of The Empire |
| .sof | Quartus II SRAM Object |
| .soi | MENSI (Trimble) 3D Laser Enhanced 3D Scanner |
| .sol | Adobe Flash Shared Object Format |
| .solidconfig | STAR WARS: The Old Republic Launcher Config |
| .solitairesave-ms | Windows Solitaire Saved Game Format |
| .som | Corel Paradox Sort Information |
| .son | Notator SL Audio |
| .song | System 7 Sound |
| .sonic | SonicArranger Audio Format |
| .sopt | Synclavier Optical Disk Image Format |
| .sor | Corel Paradox Sort Definition |
| .sos | Dynamite VSP Swept Object Style |
| .sou | Lucas Arts Sound Format |
| .soundpack | Stardock SoundPackager Sound Package Format |
| .sounds | Quake 3 Id Tech 3 Sound Definition Format |
| .soundscript | Rigs Of Rods Sound Script Description |
| .soundstudiopreset | Sound Studio Preset |
| .sov | 3DCS Advanced Analyzer/Optimizer SOVA Model |
| .sow | Renamed ARJ Archive Format |
| .sox | Unix Sox Native Raw Sound |
| .sp | SPICE Data Format |
| .sp1 | Microsoft Windows XP With Service Pack 1 Installation |
| .sp2 | Super Ball 2 Level Format |
| .sp3 | Microsoft Windows XP With Service Pack 3 Installation Format |
| .sp4 | Roller Coaster Tycoon Saved Game |
| .sp45 | SuperCard Player Format |
| .sp7 | SAS Permanent Utility |
| .sp? | LoseThos C+ Source |
| .spa | FutureSplash Movie (Adobe Flash) |
| .spar | Spartan Chemical Modeller Output |
| .sparc | Skype Extra Plug-in Format |
| .sparsebundle | Apple Mac OS X Time Machine Dynamic Image Format |
| .sparseimage | Apple MAC OS X Sparse Disk Image Format |
| .sparsimage | Mac OS X Image |
| .spawn | S.T.A.L.K.E.R. Game |
| .spb | Samsung Kies Phone Contacts Library |
| .spc | Atari Compressed Spectrum Bitmap Format |
| .spd | Bitstream Speedo Scalable Font |
| .spdata | Microsoft Visual Studio |
| .spdb | IGO Primo Speedcam Database |
| .spdesignasax | SharePoint Designer |
| .spdesignasmx | SharePoint Designer |
| .spdesignbar | SharePoint Designer |
| .spdesignbot | SharePoint Designer |
| .spdesignconfig | SharePoint Designer Configuration |
| .spdesigncss | SharePoint Designer |
| .spdesigndoclib | SharePoint Designer Design Library |
| .spdesignfile | SharePoint Designer |
| .spdesignhomeop | SharePoint Designer |
| .spdesignhomepg | SharePoint Designer |
| .spdesignhtml | SharePoint Designer |
| .spdesignhtt | SharePoint Designer |
| .spdesignlist | SharePoint Designer |
| .spdesignlistdata | SharePoint Designer |
| .spdesignmaster | SharePoint Designer |
| .spdesignnav | SharePoint Designer |
| .spdesignnopub | SharePoint Designer |
| .spdesignopen | SharePoint Designer |
| .spdesignpiclib | SharePoint Designer |
| .spdesignresx | SharePoint Designer |
| .spdesignsitemap | SharePoint Designer Site Map |
| .spdesignskin | SharePoint Designer Skin |
| .spdesignsurvey | SharePoint Designer |
| .spdesigntheme | SharePoint Designer Theme |
| .spdesigntxt | SharePoint Designer |
| .spdesignunknown | SharePoint Designer |
| .spdesignweb | SharePoint Designer |
| .spdesignwfdoclib | SharePoint Designer |
| .spdesignxml | SharePoint Designer |
| .spdesignxoml | SharePoint Designer |
| .spdesignxslt | SharePoint Designer |
| .spdf | Sealed PDF Document Format |
| .spe | WinSpec CCD Capture Format |
| .spec | RPM Specification Format |
| .spentry | Spartan Database |
| .spf | Still Picture Interchange File Format |
| .spfx | Squeeze Preset Format |
| .spg | TCP Optimizer Saved Settings Format |
| .sph | Ribbons Sphere Format |
| .spi | ShadowProtect Incremental Disk Changes Format |
| .spidersolitairesave-ms | Microsoft Spider Solitaire Save Format |
| .spiff | SPIFF Still Picture Interchange File Format |
| .spin | Apple Mac OS X Console Spin Report |
| .spinput | Spartan Job |
| .spj | Microsoft ICE Panorama Project |
| .spk | SpyProof! Encrypted Symmetric Key Format |
| .spkz | Scribe Template |
| .spl | Microsoft Windows Printing Spool Format |
| .spl7 | SPlan Data |
| .split | Split |
| .splsp | SmartPLS Project |
| .splt | YDecode Split |
| .splx | Code Package |
| .spm | Corel WordPerfect |
| .spmo | SpeedView Meta Object |
| .spn | Corel WordPerfect Distribution |
| .spo | SPSS Output Document Format |
| .spp | Serif PhotoPlus Format |
| .sppack | SPPack Sound Sample |
| .sppt | Sealed Microsoft PowerPoint Presentation |
| .spq | SPSS Database Query Format |
| .spr | Microsoft FoxPro Form Source Format |
| .spreporter | Mac OS X System Profiler Reporter |
| .sprg | Synclavier Program Format |
| .sprite | SuperTux Sprite Format |
| .sprj | Microsoft Application Virtualization Sequencer Project |
| .sprx | Sony Playstation 3 SPRX Firmware |
| .sps | SPSS Proprietary Syntax Format |
| .spss | SPSS |
| .spt | SpeedTree Tree Data Format |
| .spu | Atari Spectrum Bitmap Image Format |
| .spub | BeLight Disc Cover Format |
| .spv | American McGee Alice Saved Game Format |
| .spw | SLIM-Master Plan Workbook |
| .spx | Ogg Vorbis Speex Format |
| .spy | SEO SpyGlass Project |
| .sq | Sysquake Program Format |
| .sqb | SQL Backup Compact MS SQL Server Backup Format |
| .sqd | Sysquake Session Data Format |
| .sqf | Sothink SWF Quicker Project Format |
| .sqfs | SquashFS Bootable Format |
| .sqh | Harbinger Game |
| .sql | Structured Query Language Data SQL Format |
| .sqldataprovider | DotNetNuke Script |
| .sqlite | SQLite Database Format |
| .sqlite-journal | Mozilla Firefox |
| .sqlite-shm | SQLite Shared Memory |
| .sqlite-wal | SQLite Quasi-persistent |
| .sqlite3 | SQLite 3 Database Format |
| .sqlite3-journal | SQLite Temporary |
| .sqlitedb | SQLite Database Format |
| .sqlitedb-shm | SQLite Database Shared Memory |
| .sqljet | Eclipse JET SQL Template |
| .sqlproj | Microsoft Visual Studio SQL Server Project Format |
| .sqm | Microsoft Service Quality Monitoring Format |
| .sqn | SAS Sequential Access |
| .sqr | SQL Structured Query Language Program Format |
| .sqs | Operation Flashpoint Game Script |
| .squ | LabWindows/CVI Test Executive Toolkit Sequence |
| .squashfs | Squashfs-tools Disk Image Format |
| .sqx | SQX Archiver Compressed Archive Format |
| .sqy | Xaira Query |
| .sqz | Squeeze Project Format |
| .sr | Sun Raster Bitmap Graphics Format |
| .sr0 | Sony SecuROM Analysis Format |
| .sr2 | Sony Digital Camera RAW Image Format |
| .sr4 | SIR Database |
| .sra | Powerbuilder Application |
| .src | Generally Source Code Format |
| .src.rpm | Red Hat Package Manager Source Format |
| .srd | PowerBuilder Data Window |
| .sre | Windows CE 5.0 |
| .srep | SuperREP Archive Format |
| .srf | Sony Digital Camera RAW Image Format |
| .srfmap | Terragen Map |
| .srg | Microsoft PowerPoint Self-registration Data Format |
| .sri | Dragon NaturallySpeaking Audio |
| .srj | PowerBuilder Project |
| .srk | Sub Rosa Client Format |
| .srl | Arquitienda Local Database |
| .srm | Super Nintendo ROM Saved Game Emulator Format |
| .srp | Checkpoint Exported VPN Client Information |
| .srpm | Linux Source RPM Package |
| .srq | Microsoft Windows Server Unprocessed Request |
| .srr | ReScene Data Recovery Archive Format |
| .srs | Microsoft Outlook Server Request Setting Format |
| .srt | SubRip Video Subtitle Format |
| .srt0 | Nintendo Wii Animation Format |
| .sru | PowerBuilder User Object |
| .srv | FBB Initialization |
| .srw | Samsung Raw Picture Image Format |
| .srx | SPARQL Query Results XML Format Result |
| .srz | DataFlex Source |
| .ss | Scheme Source Code Format |
| .ss0 | GameBoid First Saving Slot |
| .ss4 | SigScribe4 Design |
| .ssa | SubStation Alpha Subtitle Format |
| .ssage | Inbound Internet Email Message |
| .ssb | SmartSync Pro Program Setting |
| .ssc | SourceSafe Status Format |
| .sscs | Saropa Smart Copy Script |
| .ssd | Stardock WindowBlinds Skin File List |
| .ssd01 | Unix SAS Data Sets |
| .ssdl | Sonicfire Pro Music |
| .sse | StrataSearch |
| .sseq | Nintendo DS Sound Format |
| .ssf | Trimble Standard Storage Format |
| .ssfsav | Super Smash Flash Saved Game Format |
| .ssg | Single-Step Goal Template |
| .ssh | Data Fellows Secure Shell Document |
| .ssi | HTML With Server Side Includes |
| .ssif | Blu-ray Stereoscopic Interleaved Movie |
| .ssii | ProReveal Data Format |
| .ssis | ProReveal Settings Format |
| .ssisdeploymentmanifest | Microsoft Visual Studio Deployment |
| .ssiw | Corel WordPerfect 4 For Mac Document |
| .sskd | On Schedule Schedule |
| .ssl | Sunlight ScanLibrary Format |
| .ssl2 | Sunlite Suite 2 ScanLibrary Settings Format |
| .sslf | HLSW Game Server Tool Format |
| .ssm | RealAudio Standard Streaming Metafile |
| .ssml | Speech Synthesis Markup Language Source |
| .ssmssqlproj | Microsoft SQL Server Project |
| .ssn | Shutdown Scheduler Shared Notes Data |
| .ssnd | Synclavier Sound Format |
| .sso | ChessDB Search Options |
| .ssp | SAS Transport Data Format |
| .sss | WindowBlinds Substyle Format |
| .sss~ | WindowBlinds Temporary |
| .sst | Serialized Certificate Store Format |
| .ssu | Systems Management Server Hierarchy Manager Site Update |
| .ssv | ShadowFlare Saved Game Format |
| .ssw | Sealed Flash Format |
| .sswf | Sealed SWF Flash |
| .ssx | IBM Rational XDE |
| .ssy | W32/Sober-AD |
| .ssz | Spider Player Skin |
| .st | Atari Disk Image Format |
| .st0 | SPICE Status |
| .st1 | SPICE Status |
| .st2 | SPICE Status |
| .st3 | SPICE Status |
| .st4 | Pinnacle Studio 400 Project |
| .st45 | SuperCard Trial Project Format |
| .st5 | SBIG CCD Camera ST-x Image |
| .st6 | SBIG CCD Camera ST-x Image |
| .st7 | SBIG CCD Camera ST-x Image |
| .st8 | SBIG CCD Camera ST-x Photo |
| .st9 | SPICE Status |
| .sta | Abaqus/CAE Information Summary Format |
| .stap | Apple Soundtrack Pro Project Format |
| .startupinfo | E-Prime 2.0 Startup Info Format |
| .stat | Statistics |
| .state | Windows Photo Gallery User |
| .states | IconX Preset |
| .staticmesh | Battlefield Static Mesh |
| .stats | FreeSurfer Statistics Format |
| .status | UDraw(Graph) |
| .stb | AutoCAD R2000 Plot Style Table |
| .stbom | CATIA Stbom |
| .stc | OpenOffice.org Calc Spreadsheet Template Format |
| .std | Adobe Acrobat Exchange Plug-in Format |
| .stdl | Swift To-Do List Database |
| .ste | Adobe Dreamweaver Backup Site Settings Format |
| .steamstart | Valve Steam Start Format |
| .step | ISO-10303 STEP Product Data |
| .stf | Microsoft ACME Setup Table Format |
| .stfx | SampleTank Settings |
| .stg | Microsoft ActiveSync Backup Format |
| .sth | Lotus Domino Stash Format |
| .sti | StarOffice Presentation Template Format |
| .stip | SampleTank Instrument Preset |
| .stk | Personal Stock Monitor Format |
| .stl | Stereolithography Format |
| .stm | HTML Server Side Include Format |
| .stmb | Synclavier Timbre Format |
| .stml | HTML Server Side Include Format |
| .stmp | Apple Soundtrack Pro Project |
| .stn | ArcView Geocoding Standardization |
| .stn= | Genuine Fractals STING |
| .sto | PRO100 Project Format |
| .story | Storyist Document |
| .storyboard | Interface Builder Storyboard Document |
| .storyisttheme | Storyist Application Theme Format |
| .storymill | StoryMill Project Format |
| .stot | Mac OS Help Index |
| .stp | ISO-10303 STEP Product Data Format |
| .stproj | Samsung Theme Designer Project Format |
| .stq | StatSoft Statistica Text |
| .str | DBase Structure List Object Format |
| .strd | Octatrack Project |
| .streamed | Rage Id Tech 5 Game Language |
| .strg | E-Viewer Recorded Video Copy Backup |
| .strings | Text Strings Format |
| .strk | Geologger Track Format |
| .strm | Plex Media Server Settings |
| .struct | Microsoft XPS Document Structure |
| .sts | ScreamTracker Song Format |
| .stsg | SuperTux Saved Game |
| .stt | Microsoft Streets & Trips Map Template Format |
| .sttpl | Samsung Theme Designer Template Format |
| .stu | Pinnacle Studio Video Project Format |
| .stub | Mac OS X Stub Library |
| .stuff | Eve Online Game Archive |
| .stvproj | Microsoft Visual Studio |
| .stw | OpenOffice.org Text Document Template |
| .stwm | SuperTux Map Format |
| .stx | Pinnacle Studio Project Format |
| .stxt | Sealed Text Document |
| .sty | LaTeX Style Format |
| .styk | Stykz Stick Figure Format |
| .stykz | Stykz Animation Format |
| .styl | Stylus CSS Script |
| .style | SketchUp Style Format |
| .styles | Steam Client GUI Resource |
| .stz | Screamtracker 2 Module Format |
| .su | SUwin Project |
| .su3 | Su3De |
| .su? | Standard Mail Archive |
| .sua | SeeYou Airspace |
| .sub | DivX Movie Subtitle File Format |
| .sublime-build | Sublime Text Build |
| .sublime-completions | Sublime Text Completions |
| .sublime-keymap | Sublime Text Keymap |
| .sublime-menu | Sublime Text Menu |
| .sublime-mousemap | Subliem Text Mousemap |
| .sublime-package | Sublime Text Compressed Extension Package |
| .sublime-project | Sublime Text Project Format |
| .sublime-session | Sublime Text Session |
| .sublime-settings | Sublime Text Settings |
| .sublime-theme | Sublime Text Theme |
| .sublime-workspace | Sublime Text Workspace Settings Format |
| .suc | Softrans Hello Engines! 2.1 |
| .sucatalog | Apple Mac OS X Software Update SUCatalog |
| .suck | SiteSucker Website Format |
| .sud | WISCO Word Power Sudoku Number Puzzle Format |
| .suf | Ccrypt Encrypted Format |
| .sugar | Espresso Plug-in Format |
| .sui | StarSplatter User Interface Format |
| .suit | Apple Mac OS Font Format |
| .suite | Stardock WinStyles Suite |
| .sul | Gfa Raytrace Image |
| .sum | Summary Format |
| .sumo | Sumo Paint Image Format |
| .sun | Sun Raster Bitmap Image Format |
| .sun4 | SunOS Solaris 4 |
| .suniff | Sun TAAC Bitmap Image Format |
| .suo | Microsoft Visual Studio Solution User Options Format |
| .sup | Subtitle Bitmap Format |
| .supp | Apple IOS Format |
| .supported | MAC OS X |
| .sur | Freelancer Three Dimensional Collision Zone Data |
| .surf | Surf 3D Scanner |
| .surfplace | Microsoft Money User Profile |
| .sus | Synergy Accounts Update Script |
| .sut | ELITEpro Data Logger |
| .sv$ | AutoCAD Autosave Format |
| .sv1 | RollerCoaster Tycoon Saved Game |
| .sv2 | RollerCoaster Tycoon Saved Game |
| .sv2i | Symantec Backup Exec System Index Format |
| .sv4 | RollerCoaster Tycoon Saved Game |
| .sv4cpio | System V Release 4 CPIO Archive |
| .sv4crc | GnuWin32 CPIO Checksum Data |
| .sv5 | BigJig Saved Puzzle Format |
| .sv6 | RollerCoaster Tycoon 2 Saved Game Format |
| .sv8 | RollerCoaster Tycoon |
| .sva | Sharp Manga Browser Comic Format |
| .svb | STATISTICA Macro |
| .svc | Microsoft Visual Studio ASP.NET WCF Web Service Format |
| .svclog | Microsoft Visual Studio Diagnostics |
| .svcmap | Windows Communication Foundation WCF Reference |
| .svd | Microsoft Word Document Autosave Format |
| .sve | Simutrans Format |
| .svf | Simple Vector Format |
| .svg | XML Based Vector Graphics Format |
| .svgz | Compressed SVG (Scalable Vector Graphics) Format |
| .svh | Fly! Simulated Vehicle Specification |
| .svi | Samsung Video Format |
| .svl | Scramdisk Volume |
| .svm | OpenOffice.org StarView Metafile |
| .svn | Personal Paint Slovenian Language User Interface |
| .svn-base | Apache Subversion Base Format |
| .svn-work | CollabNet Subversion Cache Format |
| .svo | STATISTICA Macro |
| .svp | Virtual DJ Visualization Effects |
| .svq | Roland Keyboard Midi Sequence |
| .svr | Compressed Virtual World |
| .svs | Microsoft Word Style Sheet Autosave Format |
| .svt | Torchlight Saved Game Format |
| .svw | SpecView Format |
| .svx | Sound File (Amiga 8SVX Format) |
| .svz | Savez |
| .sw | 16-bit Audio Sound Raw Signed PCM Data Format |
| .sw0 | SPICE Sweep Operations Output |
| .sw1 | SPICE Sweep Operations Output |
| .sw2 | SPICE Sweep Operations Output Format |
| .sw3 | SPICE Sweep Operations Output |
| .sw4 | SPICE Sweep Operations Output |
| .sw5 | SPICE Sweep Operations Output |
| .sw6 | SPICE Sweep Operations Output |
| .sw7 | SPICE Sweep Operations Output |
| .sw8 | SPICE Sweep Operations Output |
| .sw9 | SPICE Sweep Operations Output |
| .swa | Adobe Shockwave Music Format |
| .swav | Nintendo DS Audio Format |
| .swb | Adobe Photoshop |
| .swc | Adobe Flash Component Distribution Format |
| .swd | Adobe Flash Debug Format |
| .swdb | ClarisWorks 3 And 4 Database |
| .swe | NHL Ice Hockey 2002 Required |
| .sweb | SpiderWEB Document |
| .swf | ShockWave Flash, Animated Vector Format For The Internet |
| .swf2 | Flash |
| .swfl | Shockwave Flash |
| .swg | SWAG Pascal Snippets (SWAG Reader) |
| .swgr | ClarisWorks Version 3/4 Drawing |
| .swi | SWiSH Format |
| .swidtag | Software Identification Tag |
| .swift | Apple Swift Programming Language Source Code |
| .swish-e | SWISH-E |
| .switch | Egress Switch Package Format |
| .switchboard | Adobe SwitchBoard Server |
| .swj | SolidWorks Journal Format |
| .swk | StudyWorks Save Format |
| .swl | Macromedia Flash Format [Alternate] |
| .swlt | SafeWallet |
| .swm | Windows Imaging Format Split Archive Format |
| .swn | Vim Temporary |
| .swo | Vim Temporary |
| .swp | Swap Format |
| .swq | SWAT Stream Water Quality Input |
| .sws | SWiSh Studio |
| .swss | ClarisWork Spreadsheet |
| .swt | Swift Generator Template Format |
| .swtag | Adobe Creative Suite Software Tag |
| .swv | Microsoft Sidewinder Game Voice Settings Format |
| .sww | ANNO Saved Game Format |
| .swz | Adobe Flash Player Signed RSL Format |
| .sx | SimplexNumerica Data Format |
| .sxc | OpenOffice.org 1.0 Spreadsheet Format |
| .sxd | OpenOffice/StarOffice Drawing |
| .sxe | ProfiCAD Document |
| .sxg | OpenOffice.org Master Document Format |
| .sxi | OpenOffice.org Presentation Format |
| .sxl | Sealed Excel Worksheet |
| .sxls | Sealed Excel Spreadsheet |
| .sxlsx | Sealed Microsoft Excel 2007 Worksheet |
| .sxm | OpenOffice.org 1.0 Math Format |
| .sxml | Sealed XML Document |
| .sxs | SAS Stat Studio Module Source Code |
| .sxt | Propellerheads Reason 2 NN-XT Sound Format |
| .sxv | Action Repeater Macro |
| .sxw | OpenOffice.org Writer Document Format |
| .sxx | SAS Stat Studio Module Executable |
| .sy | Simplexety Data Format |
| .sy0 | WordExpress |
| .sy1 | Synth 1 Patch |
| .sy3 | Harvard Graphics Symbol Format |
| .sy7 | Synchro Studio 7 Output |
| .syb | Syberia II Game Archive Format |
| .syc | Sniffer Capture |
| .syd | SYSTAT Data |
| .syg | SYSTAT Graph |
| .syh | Synchomatic Instrument Format |
| .syk | Microsoft Excel Symbolic Link Format |
| .sylk | Microsoft Excel For Mac Symbolic Link Format |
| .sym | Symbols Library Format |
| .syn | Synthesis Audio Format |
| .sync | Apple ColorSync |
| .syncdb | ITunes Saved Contact Database |
| .syndarticle | Paralllels Desktop |
| .synk5licence | Synk 5 Licence |
| .synklicence | Synk Licence |
| .synu | Synthetic Universe Image Format |
| .syp | SYP Source |
| .sys | System Format |
| .sys-old | Cygwin Terminfo |
| .sysk | Cygwin Terminfo |
| .system | Vega Strike Virtual System Format |
| .systemIncludeDirectoriesList | Java Language |
| .syv | Outline 4D |
| .syw | Yamaha SY-85/SY-99 Wave Format |
| .syx | MIDI System Exclusive Message |
| .sy_ | Korg Dw8000 Compressed Format |
| .sy~ | CorelDRAW |
| .sz | Winamp Skin Format |
| .sz3 | ScreamTracker V3 |
| .sza | HiCAD NeXt Construction |
| .szf | SilverDAT II Data Exchange Format |
| .szp | SecureZIP Policy |
| .szs | Mario Kart Wii Game Archive Format |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
