| 1 | S | N/A | Source Code Format |
| 2 | S01 | Corel Corporation | Corel WordPerfect Distribution Format |
| 3 | S02 | Corel Corporation | Corel WordPerfect Distribution Format |
| 4 | S03 | Corel Corporation | Corel WordPerfect Distribution |
| 5 | S16 | N/A | Digital Voice Recorder Audio File |
|
| 6 | S19 | Motorola | Motorola S19 Format Record |
| 7 | S1P | N/A | Touchstone 1 S-parameter Data |
| 8 | S2DB | N/A | SQLite 2.0 database |
| 9 | S2K | N/A | Subtitle |
| 10 | S3DB | N/A | MySQL Database |
| 11 | S3M | Future Crew | ScreamTracker 3 Module |
| 12 | S3P | N/A | Touchstone 9 S-parameters Data |
| 13 | S43 | Texas Instruments Inc. | IAR Assembly Source |
| 14 | S4P | N/A | Touchstone 16 S-parameters Data |
| 15 | S7P | N/A | SubSeven Trojan |
| 16 | SAAS | N/A | Sass Indented Syntax |
| 17 | SAB | Spatial | ACIS SAB Model Format |
| 18 | SABL | Activision | Call Ot Duty: Black Ops II Audio Library |
| 19 | SABS | Activision | Call Ot Duty: Black Ops II Sounds |
| 20 | SAD | Lionhead Studios | Black & White Audio Format |
| 21 | SAK | Running With Scissors | Postal Game Archive |
| 22 | SAL | Oracle Corporation | SQL Application Language |
| 23 | SAM | Samna | Ami Pro Document |
| 24 | SAMBA3 | The GNOME Project | Gnome Desktop |
| 25 | SAMI | Sublime HQ Pty Ltd | Synchronized Accessible Media Interchange Format |
| 26 | SAN | LucasArts Entertainment Company, LLC | LucasArts Smush Animation Format |
| 27 | SAR | SAP AG | SAR Compressed Format Archive (SAPCAR Archive) |
| 28 | SAS7BDAT | SAS Institute Inc. | SAS Database |
| 29 | SASS | N/A | Syntactically Awesome Stylesheets Indented Syntax |
| 30 | SAT | Spatial | ACIS SAT 3D Model Format |
| 31 | SAV | Nintendo | Saved Game |
| 32 | SAVE | Nano | Nano Temporary Save Format |
| 33 | SAVEDSEARCH | Apple | Spotlight Saved Search |
| 34 | SB | MIT | Scratch Project Format |
| 35 | SB2 | MIT | Scratch 2.0 Project File |
| 36 | SB3 | MIT | Scratch 3.0 Project File |
| 37 | SBD | Mozilla | Mozilla Mail Subdirectory Format |
| 38 | SBF | N/A | Android System Format |
| 39 | SBK | Creative Labs | Creative Labs EMU SoundFont V1 Bank Format |
| 40 | SBL | Procedimientos-Uno, S.L. | Arquitienda Graphic Symbol Library |
| 41 | SBML | N/A | Systems Biology Markup Language Source |
| 42 | SBR | Microsoft | Visual Studio Source Browser Intermediate Format |
| 43 | SBSAR | Allegorithmic | Substance Archive |
| 44 | SBST | Adobe Systems Incorporated | Adobe Soundbooth Score Template |
| 45 | SBSTORE | Mozilla Corporation | Mozilla Firefox |
| 46 | SBT | URUWorks | SBT Subtitle Format |
| 47 | SBU | Samsung Group | Samsung Kies Backup |
| 48 | SBX | Adobe | Adobe Illustrator Tsume Format |
| 49 | SC2REPLAY | Blizzard Entertainment | Blizzard StarCraft 2 Replay Format |
| 50 | SC4 | Electronic Arts | SimCity 4 Saved Format |
| 51 | SC4MODEL | Electronic Arts | SimCity 4 Model Format |
| 52 | SCAP | N/A | EFI Firmware Format |
| 53 | SCB | Electronic Arts, Inc. | Command & Conquer World Builder Script Format |
| 54 | SCBO | N/A | MacBook EFI unlock data |
| 55 | SCF | N/A | Windows Explorer Command |
| 56 | SCH | Autodesk | CAD Schematics Format |
| 57 | SCI | Scilab Enterprises | Virtumonde / Vundo Trojan Infected Format |
| 58 | SCONSCRIPT | N/A | SCons SConscript Configuration |
| 59 | SCPT | Apple | AppleScript Script Format |
| 60 | SCPTD | Apple, Inc. | AppleScript Script Bundle |
| 61 | SCR | Microsoft | Windows Screensaver |
| 62 | SCRIPT EDITOR | N/A | AppleScript script |
| 63 | SCRIPTSUITE | Apple | AppleScript Script Suite Format |
| 64 | SCRIPTTERMINOLOGY | Apple | AppleScript Script Terminology Format |
| 65 | SCSS | N/A | Syntactically Awesome Stylesheets Syntax |
| 66 | SCT | Scitex | Scitex Continuous Tone Format |
| 67 | SCUT2 | Craft Edge Software | Sure Cuts A Lot |
| 68 | SCVINFO | Microsoft Corporation | Windows Communication Foundation WCF Metadata |
| 69 | SD1 | Adobe Systems Incorporated | Dali Raw Image |
| 70 | SD2 | Avid Technology | Sound Designer II Format |
| 71 | SD2F | Avid Technology | Sound Designer 2 Format |
| 72 | SDA | Oracle | StarOffice Drawing |
| 73 | SDB | Computers & Structures | OpenOffice Base Database Format |
| 74 | SDC | Oracle | Apache OpenOffice Calc Spreadsheet |
| 75 | SDD | Oracle | StarOffice Presentation |
| 76 | SDEF | Apple | AppleScript Dictionary Document |
| 77 | SDF | Microsoft | Standard Data Format |
| 78 | SDG | Oracle Corporation | StarOffice Gallery Image Format |
| 79 | SDII | Avid Technology | Sound Designer 2 Audio Format |
| 80 | SDIR | Apple, Inc. | Apple Logic Space Designer Impulse Response |
| 81 | SDIRPROJ | Apple, Inc. | Apple Impulse Response Utility Project |
| 82 | SDKMESH | Microsoft Corporation | Microsoft DirectX Vertex Mesh |
| 83 | SDL | N/A | Corel Paradox Script Format |
| 84 | SDNF | N/A | Steel Detailing Neutral Format |
| 85 | SDP | N/A | Session Description Protocol Format |
| 86 | SDS | N/A | MIDI Sample Dump Standard Format |
| 87 | SDW | LizardTech | StarOffice Writer Text Document |
| 88 | SDXF | N/A | Structured Data eXchange Format |
| 89 | SEA | Smith Micro | Self-Extracting Archive |
| 90 | SEARCH-MS | Microsoft | Windows Saved Search Format |
| 91 | SEARCHCONNECTOR-MS | Microsoft | Windows Search Connector Format |
| 92 | SEARCHINDEXCACHE | Apple, Inc. | Mac OS X Cache |
| 93 | SECURECRYPTED | N/A | Apocalypse ransomware affected file |
| 94 | SECURITY | Oracle Corporation | Javasoft Jre 1.3 Lib Security |
| 95 | SEG1 | Smith Micro Software, Inc. | StuffIt Segment |
| 96 | SEPLUGIN | Apple | AppleScript Editor Plug-in |
| 97 | SER | Applied Biosystems | GeneMapper Project Format |
| 98 | SERVICE | Lennart Poettering and Kay Sievers | Mac OS X Service Application |
| 99 | SES | Adobe Systems | Audition Session Format |
| 100 | SESSION | Dassault Systemes | CATIA 4 Session Format |
| 101 | SESX | Adobe Systems | Adobe Audition Session Format |
| 102 | SETUP | Crytek | CryENGINE Character Setup Format |
| 103 | SEW | N/A | Janome Sewing Machine Stitch Format |
| 104 | SF2 | E-mu Systems | SoundFont 2 Sound Bank |
| 105 | SFA | Sony Corporation | Sony Sound Forge |
| 106 | SFB | Sony | PlayStation 3 Disc Data Format |
| 107 | SFCACHE | Microsoft | ReadyBoost Cache Format |
| 108 | SFF | Elecbyte | Structured Fax Format Image Format |
| 109 | SFK | Sony | Sound Forge Audio Peak Format |
| 110 | SFR | N/A | Sonic Foundry Sample Resource |
| 111 | SFS | Squad | Squashfs Format Archive |
| 112 | SFV | N/A | Simple Format Verification Format |
| 113 | SFW | Seattle FilmWorks | Seattle FilmWorks Image |
| 114 | SFX | N/A | Windows Self-Extracting Archive |
| 115 | SFZ | ACE | SoundFont Compressed Audio |
| 116 | SGA | Relic Entertainment | Relic Entertainment Game Archive |
| 117 | SGF | Oracle Corporation | StarOffice Document With Graphics |
| 118 | SGI | Silicon Graphics | Silicon Graphics Image Format |
| 119 | SGL | N/A | OpenOffice.org/StarOffice Master Document |
| 120 | SGU | PG Music Inc. | Band-in-a-Box MIDI |
| 121 | SGV | Oracle Corporation | StarOffice StarDraw 2.0 Picture Image |
| 122 | SGY | SEG Technical Standards Committee | SEG-Y Data File |
| 123 | SH | N/A | Bash Shell Script |
| 124 | SH3 | N/A | Harvard Graphics 3.0 Presentation |
| 125 | SHA | The Open Group | Unix SHAR Archive |
| 126 | SHA1 | N/A | SHA-1 Hash Format |
| 127 | SHA256 | FileVerifier++ | FileVerifier++ SHA-256 Hashes Format |
| 128 | SHA512 | N/A | SHA 512 Hash Format |
| 129 | SHADER | id Software | Quake 3 Engine Shader Format |
| 130 | SHADER_BUNDLE | N/A | Avalanche Studios game graphics |
| 131 | SHADOWINDEXGROUPS | Apple, Inc. | Mac OS X Spotlight |
| 132 | SHADOWINDEXTERMIDS | N/A | Mac OS X Spotlight |
| 133 | SHAR | N/A | Unix Shar Archive |
| 134 | SHC | Adobe Systems | Adobe Photoshop Contours Format |
| 135 | SHIT | N/A | Bourne Shell Server Page |
| 136 | SHLB | Mozilla Corporation | Mozilla |
| 137 | SHM | Corel Corporation | Corel WordPerfect Shell Macro Library |
| 138 | SHN | Shorten | Shorten Compressed Audio Format |
| 139 | SHP | N/A | Shapes Format |
| 140 | SHR | N/A | Unix Shell Archive Format |
| 141 | SHS | Microsoft | Microsoft Scrap Format |
| 142 | SHSH | Apple | IPhone/iPod Touch SHSH Blob Format |
| 143 | SHT | N/A | HTML Format With Server Side Includes |
| 144 | SHTM | N/A | HTML Server Side Include Format |
| 145 | SHTML | N/A | Server Side Include HTML Format |
| 146 | SHUTDOWNSTALL | Apple, Inc. | Mac OS X Log |
| 147 | SHV | Husqvarna Viking | Husqvarna Viking Embroidery Format |
| 148 | SHW | Corel | Corel Presentation |
| 149 | SHX | Autodesk | AutoCAD Compiled Shape Format |
| 150 | SI | Autodesk | Softimage Image Format |
| 151 | SID | LizardTech | MrSID Image |
| 152 | SIDD | Apple | ITunes Authorization Data Format |
| 153 | SIDN | Apple, Inc. | Apple ITunes Authorization Data |
| 154 | SIF | Microsoft | Windows Setup Information Format |
| 155 | SIG | N/A | Signature Format |
| 156 | SIGNED | Apple, Inc. | Apple Safari |
| 157 | SIK | Microsoft Corporation | Microsoft Word Backup |
| 158 | SILK | Microsoft Corporation | Microsoft Excel Symbolic Link Format |
| 159 | SIMS3PACK | Electronic Arts | The Sims 3 Package Format |
| 160 | SISX | Symbian | Symbian OS Installation Format |
| 161 | SIT | Smith Micro | StuffIt Archive |
| 162 | SIT! | Smith Micro Software, Inc. | StuffIt Expander Archive Format |
| 163 | SIT5 | N/A | StuffIt 5 Archive Format |
| 164 | SITD | N/A | StuffIt Archive |
| 165 | SITES | Apple | IWeb Site Design Project |
| 166 | SITES2 | Apple | IWeb Site Design Project |
| 167 | SITHQX | N/A | StuffIt Compressed Archive |
| 168 | SITX | Smith Micro | StuffIt X Archive |
| 169 | SJS | Electronic Arts, Inc. | Simcity 3000 Buildings Add-on |
| 170 | SKA | N/A | Happy99 Virus |
| 171 | SKE | Electronic Arts, Inc. | Battlefield Skeleton |
| 172 | SKF | Autodesk | AutoSketch Drawing |
| 173 | SKIN | Microsoft | ASP.NET Skin Format |
| 174 | SKINNEDMESH | Electronic Arts, Inc. | Battlefield Skinned Mesh |
| 175 | SKN | Nokia | Symbian OS Skin Format |
| 176 | SKP | Trimble | SketchUp Document |
| 177 | SKSE | Bethesda Softworks | The Elder Scrolls V: Skyrim Script Extender Data |
| 178 | SKU | N/A | TomTom for R-Link map |
| 179 | SKUDEF | Electronic Arts, Inc. | Command & Conquer Archive Description Package |
| 180 | SKY | Microsoft Corporation | Microsoft Multiplan SYLK Spreadsheet |
| 181 | SL | N/A | Software License Format |
| 182 | SL2 | N/A | Generic |
| 183 | SL3 | N/A | Generic |
| 184 | SLB | Cadence Design Systems, Inc | PSpice Symbols Library Format |
| 185 | SLD3 | Microsoft Corporation | Microsoft PowerPoint 3/4 For Mac Slide |
| 186 | SLD8 | Microsoft Corporation | Microsoft PowerPoint 98 For Mac Slide |
| 187 | SLDASM | Dassault Systemes | SolidWorks Assembly Format |
| 188 | SLDDRW | Dassault Systemes | SolidWorks Drawing Format |
| 189 | SLDM | Microsoft Corporation | Microsoft PowerPoint 2007/2010 Macro-enabled Open XML Slide |
| 190 | SLDPRT | Dassault Systemes | SolidWorks Part Format |
| 191 | SLDS | Microsoft Corporation | Microsoft PowerPoint 2 For Mac Slide |
| 192 | SLDX | Microsoft Corporation | Microsoft PowerPoint 2007/2010 Open XML Slide |
| 193 | SLF | Symantec | Symantec License Format |
| 194 | SLIB | Synopsys, Inc. | Synopsys Interface Timing Specification Model |
| 195 | SLIDESAVER | Apple, Inc. | Mac OS X Screensaver |
| 196 | SLIM | N/A | Slim Script |
| 197 | SLIP | Embarcadero Technologies, Inc. | CodeGear Licence |
| 198 | SLK | Microsoft | Symbolic Link Format |
| 199 | SLL | N/A | Static Link Library |
| 200 | SLMX | N/A | Simulink traceability data |
| 201 | SLN | Microsoft | Visual Studio Solution Format |
| 202 | SLR | Grassland, Soil & Water Research Laboratory | ArcSWAT Solar Radiation Input |
| 203 | SLS | N/A | Image Playlist |
| 204 | SLS3 | Microsoft Corporation | Microsoft Excel 3 For Mac Template |
| 205 | SLS4 | Microsoft Corporation | Microsoft Excel 4 For Mac Template |
| 206 | SLS5 | Microsoft Corporation | Microsoft Excel 5 For Mac Template |
| 207 | SLS8 | Microsoft Corporation | Microsoft Excel 98 For Mac Template |
| 208 | SLT | Mozilla | Mozilla User Profile Folder |
| 209 | SLTX | N/A | MATLAB Simulink model Template |
| 210 | SLXP | N/A | MATlab model |
| 211 | SM4 | RHK Technology, Inc. | RHK Technology Proprietary |
| 212 | SMALI | Google | Android Smali Assembly Language Format |
| 213 | SMB | Autodesk, Inc. | Autodesk Symbol Library |
| 214 | SMC | N/A | Super Nintendo Game ROM |
| 215 | SMD | Valve | Valve Studiomdl Data Format |
| 216 | SMF | Oracle | Standard MIDI Format |
| 217 | SMG | Dassault Systemes | SolidWorks Composer File |
| 218 | SMI | Apple | SMIL Presentation |
| 219 | SMIL | SYMM Working Group | SMIL Presentation Format |
| 220 | SMPO | N/A | Scalado SpeedView Meta Object |
| 221 | SMPX | MakeMusic, Inc. | Finale Accompaniment |
| 222 | SMTMP | N/A | Trojan:Win32/FakeSysdef Folder |
| 223 | SMWT | Adobe Systems | Adobe InDesign Filter |
| 224 | SMZIP | StepMania | StepMania Package |
| 225 | SNAPFIRESHOW | Corel | Corel SnapfireShow Format |
| 226 | SNAPX | Snapform | Snapform XML Form |
| 227 | SNB | Samsung | Shanda Bambook EBook |
| 228 | SND | N/A | Sound Format |
| 229 | SNDH | N/A | Atari ST Audio |
| 230 | SNDSHD | N/A | id Tech 4 sound shader |
| 231 | SNG | N/A | MIDI Song Format |
| 232 | SNI | Interplay Entertainment Corporation | MDK Game Archive |
| 233 | SNO | Simulation Curriculum | Starry Night Pro Data File |
| 234 | SNP | Microsoft | Access Report Snapshot |
| 235 | SNT | Microsoft | Sticky Notes Format |
| 236 | SNW | Prof. Friedrich Leisch | Sweave Source |
| 237 | SO | N/A | ELF Shared Library Format |
| 238 | SOAP | N/A | Simple Object Access Protocol Message (SOAP) Message |
| 239 | SOCIALPHONEBOOK | Google Inc. | Sony Xperia Google Android Contact |
| 240 | SOE | LucasArts Entertainment Company, LLC | Star Wars Shadows Of The Empire |
| 241 | SOL | Adobe Systems | Flash Local Shared Object Format |
| 242 | SOLITAIRETHEME8 | N/A | LoversLab renamed RAR archive |
| 243 | SOM | Corel Corporation | Corel Paradox Sort Information |
| 244 | SONG | Apple, Inc. | System 7 Sound |
| 245 | SOP | N/A | Note Song |
| 246 | SOUNDSCRIPT | N/A | Rigs Of Rods Sound Script Description |
| 247 | SP1 | Microsoft Corporation | Microsoft Windows XP With Service Pack 1 Installation |
| 248 | SP2 | Super Ball 2 | Super Ball 2 Level Format |
| 249 | SP3 | Microsoft | Microsoft Windows XP With Service Pack 3 Installation Format |
| 250 | SPA | Adone | FutureSplash Movie (Adobe Flash) |
| 251 | SPARC | Skype | Skype Plugin Archive |
| 252 | SPARSEBUNDLE | Apple | Mac OS X Sparse Bundle |
| 253 | SPARSEIMAGE | Apple | Mac OS X Sparse Image |
| 254 | SPEC | N/A | RPM Specification Format |
| 255 | SPEF | N/A | Standard Parasitic Exchange Format |
| 256 | SPLIT | Incredible Bee | Split |
| 257 | SPM | Corel Corporation | Corel WordPerfect |
| 258 | SPN | Corel Corporation | Corel WordPerfect Distribution |
| 259 | SPO | SPSS | SPSS Statistical Data Output Format |
| 260 | SPOTLIGHT-V100 | N/A | Apple Spotlight index |
| 261 | SPR | Microsoft | Microsoft FoxPro Form Source Format |
| 262 | SPRITE | SuperTux | SuperTux Sprite Format |
| 263 | SPT | Interactive Data Visualization | SpeedTree Tree Data Format |
| 264 | SPUB | BeLight Software | Swift Publisher Document |
| 265 | SPX | Xiph | Ogg Vorbis Speex Format |
| 266 | SQC | N/A | Generic |
| 267 | SQF | Bohemia Interactive | ArmA Script Format |
| 268 | SQH | DreamCatcher Interactive | Harbinger Game |
| 269 | SQL | ISO/IEC | Structured Query Language Data Format |
| 270 | SQLITE | SQLite | SQLite Database Format |
| 271 | SQLITE-JOURNAL | SQLite Development Team | Mozilla Firefox |
| 272 | SQLITE2 | N/A | SQLite 2.0 database |
| 273 | SQLITE3 | SQLite | SQLite 3 Database Format |
| 274 | SQLITEDB | SQLite | SQLite Database |
| 275 | SQM | Microsoft | Service Quality Monitoring Format |
| 276 | SQR | N/A | SQL Program Format |
| 277 | SQX | N/A | SQX Archive |
| 278 | SR | Sun Microsystems | Sun Raster Image Format |
| 279 | SR2 | Sony | Sony RAW Image |
| 280 | SRC | N/A | Source Code |
| 281 | SRG | Microsoft | Microsoft PowerPoint Self-registration Data Format |
| 282 | SRK | Cryptic Sea | Sub Rosa Client Format |
| 283 | SRL | Procedimientos-Uno, S.L. | Arquitienda Local Database |
| 284 | SRM | N/A | Super Nintendo ROM Save Format |
| 285 | SRS | Microsoft | Outlook Send/Receive Settings Format |
| 286 | SRT | N/A | SubRip Subtitle Format |
| 287 | SRX | N/A | SPARQL Query Results XML Format Result |
| 288 | SS | SilverStripe | Scheme Source Code Format |
| 289 | SSA | Kotus | Sub Station Alpha Subtitle Format |
| 290 | SSC | Microsoft | SourceSafe Status Format |
| 291 | SSDF | N/A | Generic |
| 292 | SSF | Trimble Navigation | Trimble Standard Storage Format |
| 293 | SSH | F-Secure | Data Fellows Secure Shell Document |
| 294 | SSI | Adobe Systems | Adobe Dreamweaver Server Side Include Format |
| 295 | SSIF | N/A | Blu-ray Stereoscopic Interleaved Movie |
| 296 | SSIW | Corel Corporation | Corel WordPerfect 4 For Mac Document |
| 297 | SSMSASPROJ | N/A | Microsoft SQL Server Analysis Services Project |
| 298 | SSS | Stardock | WindowBlinds Substyle Format |
| 299 | SSY | N/A | W32/Sober-AD |
| 300 | ST | N/A | Atari ST Disk Image |
| 301 | STAP | Apple | Soundtrack Pro Audio Project Format |
| 302 | STAT | Richard Hughey - Kevin Karplus - Anders Krogh | Statistics |
| 303 | STATE | libretro | Windows Photo Gallery User |
| 304 | STATICMESH | Electronic Arts, Inc. | Battlefield Static Mesh |
| 305 | STATUS | Universität Bremen | UDraw(Graph) |
| 306 | STC | Adobe Systems | OpenOffice.org Calc Spreadsheet Template Format |
| 307 | STD | Oracle | Apache OpenOffice Drawing Template |
| 308 | STE | Adobe Systems | Dreamweaver Site Settings Format |
| 309 | STEM | N/A | Native Instruments Stems audio data |
| 310 | STEM.MP4 | N/A | Native Instruments Stems audio |
| 311 | STEP | N/A | STEP 3D Model |
| 312 | STF | Microsoft | Microsoft ACME Setup Table Format |
| 313 | STH | IBM | Lotus Domino Stash Format |
| 314 | STI | Oracle | StarOffice Presentation Template |
| 315 | STL | N/A | Stereolithography Format |
| 316 | STM | Microsoft | HTML Server Side Include Format |
| 317 | STML | N/A | SSI HTML Format |
| 318 | STMP | Apple, Inc. | Apple Soundtrack Pro Project |
| 319 | STP | N/A | STEP 3D CAD Format |
| 320 | STR | dataBased Intelligence | DBASE Structure List Object Format |
| 321 | STRG | AAT Holding sp. z o.o. | E-Viewer Recorded Video Copy Backup |
| 322 | STRINGS | Apple | Text Strings Format |
| 323 | STRM | Plex Media Center Team | Plex Media Server Settings |
| 324 | STRUCT | Microsoft Corporation | Microsoft XPS Document Structure |
| 325 | STT | Microsoft | Streets & Trips Map Template |
| 326 | STUB | Apple, Inc. | Mac OS X Stub Library |
| 327 | STUFF | CCP | Eve Online Game Archive |
| 328 | STUFFIT11TASK | N/A | Stuffit scheduler task |
| 329 | STW | Oracle | StarOffice Document Template |
| 330 | STYL | Stylus team | Stylus CSS Script |
| 331 | SUB | Tiamat Software | Subtitle Format |
| 332 | SUIT | N/A | Macintosh Font Suitcase |
| 333 | SUITE | Stardock Corporation | Stardock WinStyles Suite |
| 334 | SUN | Sun Microsystems | Sun Raster Graphic Format |
| 335 | SUN4 | Sun Microsystems, Inc. | SunOS Solaris 4 |
| 336 | SUNIFF | Sun Microsystems | Sun TAAC Image |
| 337 | SUP | N/A | Subtitle Bitmap Format |
| 338 | SUPPORTED | Apple, Inc. | MAC OS X |
| 339 | SV2I | Symantec | Symantec System Index Format |
| 340 | SVC | Microsoft | WCF Web Service Format |
| 341 | SVCMAP | Microsoft Corporation | Windows Communication Foundation WCF Reference |
| 342 | SVD | Microsoft | Microsoft Word Document Autosave Format |
| 343 | SVF | JTAG | Serial Vector Format |
| 344 | SVG | Adobe Systems | Scalable Vector Graphics Format |
| 345 | SVGZ | Adobe Systems | Compressed SVG Format |
| 346 | SVM | OpenOffice Project Team | OpenOffice.org StarView Metafile |
| 347 | SVN-BASE | The Apache Project | Subversion Base Format |
| 348 | SVS | N/A | Microsoft Word Style Sheet Autosave Format |
| 349 | SVSLIDE | Sakura | Sakura VisionTek Slide Image |
| 350 | SWA | Adobe Systems | Shockwave Audio |
| 351 | SWB | Adobe Systems Incorporated | Adobe Photoshop |
| 352 | SWC | Adobe Systems | Flex Components Archive |
| 353 | SWF | Adobe Systems | Shockwave Flash Movie |
| 354 | SWF2 | Adobe Systems Incorporated | Flash |
| 355 | SWFL | Adobe Systems Incorporated | Shockwave Flash |
| 356 | SWI | SWiSHzone | SWiSH Project Format |
| 357 | SWIDTAG | N/A | Software Identification Tag |
| 358 | SWIFT | Apple, Inc. | Apple Swift Programming Language Source Code |
| 359 | SWL | Adobe Systems Incorporated | Macromedia Flash Format [Alternate] |
| 360 | SWM | Microsoft | Split Windows Imaging Format |
| 361 | SWP | Bill Joy | Vi Swap Format |
| 362 | SWT | Adobe Systems | Flash Generator Template |
| 363 | SWTAG | Adobe Systems Incorporated | Adobe Creative Suite Software Tag |
| 364 | SWW | Ubisoft Entertainment | Anno Saved Game |
| 365 | SWZ | Adobe Systems | Adobe Flash Player Cache Format |
| 366 | SXC | Sun Microsystems | StarOffice Calc Spreadsheet |
| 367 | SXD | Oracle | StarOffice Drawing |
| 368 | SXG | Oracle | Apache OpenOffice Master Document |
| 369 | SXI | Oracle | StarOffice Impress Presentation |
| 370 | SXM | Oracle | StarMath Formula |
| 371 | SXT | Propellerhead Software | Propellerhead Reason NN-XT Patch Format |
| 372 | SXW | Oracle | StarOffice Writer Document |
| 373 | SY3 | Harvard Graphics | Harvard Graphics Symbol Format |
| 374 | SYK | Microsoft Corporation | Microsoft Excel Symbolic Link Format |
| 375 | SYLK | Microsoft | Microsoft Symbolic Link Format |
| 376 | SYM | N/A | Symbols Format |
| 377 | SYMLINK | N/A | Symbolic link |
| 378 | SYNC | Apple, Inc. | Apple ColorSync |
| 379 | SYNCDB | Apple, Inc. | ITunes Saved Contact Database |
| 380 | SYS | Microsoft | Windows System Format |
| 381 | SYSTEM | The Vega Strike Team | Vega Strike Virtual System Format |
