File extensions start with character 'S'
| File Type | Category | File Format | |
|---|---|---|---|
| .s00 | Compressed Files | ZipSplitter Part 1 Archive | |
| .s01 | Compressed Files | ZipSplitter Part 2 Archive | |
| .s02 | Compressed Files | ZipSplitter Part 3 Archive | |
| .s2z | Game Files | Heroes of Newerth Game Data File | |
| .s7z | Compressed Files | Mac OS X 7-Zip File | |
| .s85 | Data Files | Sabre Airline Solutions Chart | |
| .sab | CAD Files | ACIS SAB Model File | |
| .sad | Game Files | Black & White Audio File | |
| .saf | GIS Files | Street Atlas USA Map File | |
| .safetext | Text Files | SafeText File | |
| .sai | Raster Graphics Files | PaintTool SAI Image | |
| .sam | Data Files | Ami Pro Document | |
| .sam07 | Data Files | SAM 2007 Package | |
| .sar | Data Files | Sibelius Arrange Style | |
| .sav | Game Files | Saved Game | |
| .save | Text Files | Nano Temporary Save File | |
| .sbc | Partially Downloaded Files | Office Accounting Company Shortcut File | |
| .sbd | Data Files | Office Accounting Company Data File | |
| .sbf | Android Files | Android System File | |
| .sbq | Data Files | Superbase QuickReports File | |
| .sbr | Development Files | Visual Studio Source Browser Intermediate File | |
| .sbt | Data Files | Superbase Data Notes File | |
| .sbw | Data Files | US Treasury Savings Bonds Wizard File | |
| .sbx | Adobe Files | ESRI Spatial Index File | |
| .sc2bank | Bank Files | StarCraft 2 Bank File | |
| .sc45 | Data Files | SuperCard Project File | |
| .sca | Data Files | Norton AntiVirus Scan File | |
| .scad | CAD Files | OpenSCAD Script | |
| .scap | Apple System Files | EFI Firmware File | |
| .scar | Program Execution Files | SCAR Script | |
| .scb | System Files | Scrambls Encrypted File | |
| .scc | Development Files | SourceSafe Source Code Control File | |
| .scd | Data Files | TurboTax Tax Schedule List | |
| .scexcludb | Data Files | Spring Cleaning Exclusions File | |
| .scg | Data Files | myPM SCG Definition File | |
| .sch | Microsoft Files | EAGLE Schematics File | |
| .schematic | Data Files | MCEdit Schematic File | |
| .scm | Digital Video Files | ScreenCam Screen Recording | |
| .scn | Game Files | Age of Mythology Scenario File | |
| .scr | Windows System Files | Windows Screensaver | |
| .screstore | Data Files | Spring Cleaning Restore Log | |
| .scresults | Data Files | Spring Cleaning Results File | |
| .scriv | Text Files | Scrivener Document | |
| .scrivx | Text Files | Scrivener XML Document | |
| .scs | Game Files | SimCity Societies Saved Game File | |
| .scs | Game Files | Prism3D Game Data File | |
| .sct | Raster Graphics Files | Scitex Continuous Tone File | |
| .scw | Text Files | Movie Magic Screenwriter Document | |
| .scz | Data Files | SmartDraw Collection Package File | |
| .sda | Vector Graphics Files | StarOffice Drawing | |
| .sdb | Microsoft Files | Custom Application Compatibility Database | |
| .sdc | Spreadsheet Files | OpenOffice.org Calc Spreadsheet | |
| .sdd | Data Files | StarOffice Presentation | |
| .sdf | SQL Files | Standard Data File | |
| .sdi | Disk Image Files | Windows System Deployment Image | |
| .sdm | Text Files | StarOffice Mail Message | |
| .sdn | Compressed Files | Shareware Distributors Network File | |
| .sdq | Data Files | SAS Data File | |
| .sdr | Raster Graphics Files | SmartDraw Drawing | |
| .sds | Audio Files | MIDI Sample Dump Standard File | |
| .sdt | Page Layout Files | SmartDraw Template File | |
| .sdts | Data Files | USGS Data File | |
| .sdw | Document Files | StarOffice Writer Text Document | |
| .sdx | Multiple Use Files | Kivuto Secure Download Manager File | |
| .sdz | Game Files | Spring Content Package | |
| .sea | Compressed Files | Self-Extracting Archive | |
| .sec | Multiple Use Files | PGP Secret Key Ring | |
| .sed | Configuration Files | IExpress Self Extraction Directive File | |
| .sel | Data Files | LinkOne Selection List File | |
| .sen | Data Files | SenTest Data File | |
| .seo | Data Files | SEO Note File | |
| .ser | Data Files | GeneMapper Project File | |
| .sesx | Adobe Files | Adobe Audition Session File | |
| .set | Configuration Files | Settings File | |
| .sf2 | Adobe Files | SoundFont 2 Sound Bank | |
| .sfb | Game Files | PlayStation 3 Disc Data File | |
| .sfcache | Cache Files | ReadyBoost Cache File | |
| .sfk | Adobe Files | Sound Forge Audio Peak File | |
| .sfl | Audio Files | Sound Forge Sound Data File | |
| .sfo | Configuration Files | CuteFTP Search File | |
| .sfs | OpenOffice Files | Squashfs File Archive | |
| .sfv | Multiple Use Files | Simple File Verification File | |
| .sfw | Raster Graphics Files | Seattle FilmWorks Image | |
| .sfx | Compressed Files | Windows Self-Extracting Archive | |
| .sgm | Document Files | SGML File | |
| .sgml | Data Files | Standard Generalized Markup Language File | |
| .sgn | Data Files | Slax Boot File | |
| .sh | Development Files | Bash Shell Script | |
| .shar | Compressed Files | Unix Shar Archive | |
| .shc | Data Files | Adobe Photoshop Contours File | |
| .shr | Compressed Files | Unix Shell Archive File | |
| .shs | Multiple Use Files | Microsoft Scrap File | |
| .shw | Data Files | Corel Presentation | |
| .shx | CAD Files | AutoCAD Compiled Shape File | |
| .sib | Audio Files | Sibelius Score | |
| .sidx | Data Files | StuffIt Archive Index File | |
| .sig | Signature Files | Signature File | |
| .sii | Definition Files | 18 Wheels of Steel: Haulin' Truck Definition File | |
| .sim | Data Files | SAP Tutor File | |
| .sims3pack | Package Files | The Sims 3 Package File | |
| .sis | Multiple Use Files | Symbian Installation File | |
| .sisx | Multiple Use Files | Symbian OS Installation File | |
| .sit | Compressed Files | StuffIt Archive | |
| .sitx | Compressed Files | StuffIt X Archive | |
| .skb | Backup Files | SketchUp Backup Document | |
| .skc | Data Files | SideKick Card File | |
| .sketch | Vector Graphics Files | Sketch Drawing | |
| .skim | Data Files | Skim Notes File | |
| .skm | Raster Graphics Files | SketchUp Materials File | |
| .skp | Sketchup Files | SketchUp Document | |
| .skv | Data Files | Semicolon Separated Values File | |
| .skx | Data Files | XLANG Schedule File | |
| .sla | Text Files | Scribus Document | |
| .sla.gz | Text Files | Scribus Compressed Document | |
| .sldtm | Data Files | SDL Translation Memory File | |
| .sle | Data Files | Sisulizer Package File | |
| .slf | Partially Downloaded Files | Symantec License File | |
| .slk | Data Files | Symbolic Link File | |
| .sln | Development Files | Visual Studio Solution File | |
| .slp | Audio Files | SpectraLayers Pro Project | |
| .sls | Partially Downloaded Files | Image Playlist | |
| .sma | Development Files | AMX Mod Plugin Source File | |
| .smc | Game Files | Super Nintendo Game ROM | |
| .smf | Audio Files | Standard MIDI File | |
| .smm | Data Files | Samsung Memo File | |
| .sms | Text Files | Exported SMS Text Message | |
| .sna | Backup Files | Drive Snapshot Primary Backup File | |
| .snag | Data Files | SnagIt Capture File | |
| .snapfireshow | Corel Snapfire Show Files | Corel SnapfireShow File | |
| .sonic | Data Files | DigitalMedia Project File | |
| .soundpack | Data Files | SoundPackager Sound Package | |
| .sow | Game Files | Descent ARJ Archive | |
| .sp | Page Layout Files | SignPlot Traffic Sign File | |
| .sp45 | Data Files | SuperCard Player File | |
| .sparsebundle | Apple Files | Mac OS X Sparse Bundle | |
| .sparseimage | Apple Files | Mac OS X Sparse Image | |
| .spb | Game Files | Flight Simulator Mission File | |
| .spd | Adobe Files | SPSS Custom Dialog File | |
| .spl | System Files | Windows Print Spool File | |
| .spub | Data Files | Disc Cover File | |
| .spv | Project Files | SPSS Output Document | |
| .sqf | Project Files | ArmA Script File | |
| .sqfs | Disk Image Files | Squash FS Bootable File | |
| .sql | Database Files | Structured Query Language Data File | |
| .sqlite | Database Files | SQLite Database File | |
| .sqlitedb | Database Files | SQLite Database | |
| .sqm | Microsoft Files | Service Quality Monitoring File | |
| .sqx | Compressed Files | SQX Archive | |
| .sqz | Video Files | Squeeze Project File | |
| .sr0 | Multiple Use Files | SecuROM Analysis File | |
| .sr2 | Camera Photo Files | Sony RAW Image | |
| .srep | Compressed Files | SuperREP Compressed File | |
| .srr | Backup Files | ReScene Metadata File | |
| .srt | Digital Video Files | SubRip Subtitle File | |
| .ssa | Text Files | Sub Station Alpha Subtitle File | |
| .ssf | Snagit Files | Trimble Standard Storage Format File | |
| .sst | Multiple Use Files | Serialized Certificate Store File | |
| .stb | Configuration Files | AutoCAD Plot Style Table File | |
| .steamstart | Game Files | Valve Steam Start File | |
| .step | ISO Data Files | STEP 3D Model | |
| .stk | Data Files | Stickfigure Animator File | |
| .stl | CAD Files | Stereolithography File | |
| .stm | Data Files | Exchange Streaming Media File | |
| .story | Text Files | Storyist Document | |
| .stproj | Data Files | Samsung Theme Document | |
| .str | Adobe Files | dBASE Structure List Object File | |
| .strings | Text Files | Text Strings File | |
| .stt | GIS Files | Streets & Trips Map Template | |
| .sttpl | Data Files | Samsung Theme Showcase File | |
| .stu | Data Files | Pinnacle Studio Project File | |
| .stw | Text Files | StarOffice Document Template | |
| .sty | Style Files | LaTeX Style | |
| .styk | Data Files | Stykz Stick Figure | |
| .stykz | Data Files | Stykz Animation | |
| .sub | Video Files | Subtitle File | |
| .sui | Data Files | StarSplatter User Interface File | |
| .suit | Font Files | Macintosh Font Suitcase | |
| .supp | Apple Files | iOS Application Archive File | |
| .svd | Audio Files | Roland Patch File | |
| .svf | Vector Files | Serial Vector Format File | |
| .svg | Vector Graphics Files | Scalable Vector Graphics File | |
| .svw | Data Files | SpecView File | |
| .swc | Development Files | Flex Components Archive | |
| .swf | Digital Video Files | Shockwave Flash Movie | |
| .switch | Audio Files | Switch Package | |
| .swk | Data Files | StudyWorks Save File | |
| .sxg | Text Files | OpenOffice.org Master Document | |
| .sxi | Data Files | StarOffice Impress Presentation | |
| .sxt | Audio Files | Propellerhead Reason NN-XT Patch File | |
| .sxw | Text Files | StarOffice Writer Document | |
| .sy3 | Data Files | Harvard Graphics Symbol File | |
| .sylk | Data Files | Microsoft Symbolic Link File | |
| .sys | Windows System Files | Windows System File |