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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .SOL | Adobe Systems Incorporated | Settings Files | Flash Local Shared Object File | SolVE: Local Shared Object Viewer/Editor | Open Source |
| .SON | Open Source | Audio Files | Notator SL Audio File | Notator SL | Open Source |
| .SOS | 3AM Solutions | CAD Files | Dynamite VSP Swept Object Style File | sosi2other | Open Source |
| .SOU | LucasArts Entertainment Company, LLC | Game Files | Lucas Arts Sound Data | Dragon UnPACKer | Open Source |
| .SOUNDS | id Software | Game Files | Quake 3 Engine Sound Definition File | AbiWord | Open Source |
| .SPC | Various Developers | Web Files | Software Publisher Certificate File | OpenSSL | Open Source |
| .SPEC | Open Source | Developer Files | RPM Specification File | rpmbuild | Open Source |
| .SPH | National Institute of Standards and Technology (NIST) | Audio Files | NIST SPHERE Audio File | SoX | Open Source |
| .SPLIT | Incredible Bee Ltd | Uncommon Files | Archiver Split File | PeaZip | Open Source |
| .SPM | Corel | Data Files | Corel WordPerfect Data | RPM Package Manager | Open Source |
| .SPN | Corel | Settings Files | Corel WordPerfect Distribution Definition | PSPad | Open Source |
| .SPRITE | MIT Media Lab | Raster Image Files | Scratch Sprite File | Snap! | Open Source |
| .SPS | IBM | Data Files | SPSS Program File | Mymc | Open Source |
| .SPX | Xiph.Org | Audio Files | Ogg Vorbis Speex File | XMMS | Open Source |
| .SQLITEDB | Dwayne Richard Hipp | Database Files | SQLite Database | SQLite Database Browser | Open Source |
| .SQML | Open Source | Developer Files | Standard Query Markup Language Document | SQML | Open Source |
| .SQUASHFS | Open Source | Data Files | Squashfs File System File | Squashfs | Open Source |
| .SR | Sun Microsystems | Raster Image Files | Sun Raster Image File | IrfanView | Open Source |
| .SRB | Open Source | Data Files | XWE File | XWE | Open Source |
| .SRC | Unknown Developer | Developer Files | Source Code File | gVim | Open Source |
| .SREC | Motorola | System Files | Motorola S-record Data | SRecord | Open Source |
| .SRR | Open Source | Backup Files | ReScene Metadata File | ReScene | Open Source |
| .SRT | SourceForge | Video Files | SubRip Subtitle File | Gaupol Subtitle Editor | Open Source |
| .SS | Open Source | Developer Files | SilverStripe Source Code File | SilverStripe | Open Source |
| .SSA | Open Source | Text Files | Sub Station Alpha Subtitle File | VirtualDub | Open Source |
| .SSC | Microsoft Corporation | Developer Files | SourceSafe Status File | Celestia | Open Source |
| .SSM | RealNetworks | Video Files | Standard Streaming Metafile | SSMEx | Open Source |
| .SSP | Scala | Web Files | Scala Server Page | Scalate | Open Source |
| .SST | Microsoft Corporation | Uncommon Files | Serialized Certificate Store File | Embroidermodder 2 | Open Source |
| .SSZ | Open Source | Settings Files | Spider Player Skin File | Spider Player Pro | Open Source |
| .STA | Dassault Systèmes | Data Files | ABAQUS Status File | MAME | Open Source |
| .STATS | Open Source | Data Files | FreeSurfer Statistics File | FreeSurfer | Open Source |
| .STATUS | Open Source | Data Files | UDraw(Graph) File | UDraw(Graph) | Open Source |
| .STC | Adobe Systems Incorporated | Web Files | Contribute Connection Key File | Celestia | Open Source |
| .STE | Adobe Systems Incorporated | Settings Files | Dreamweaver Site Settings File | Notepad2 | Open Source |
| .STEP | Unknown Developer | 3D Image Files | STEP 3D Model | FreeCAD | Open Source |
| .STG | Microsoft Corporation | Backup Files | ActiveSync Backup File | Visual Pinball | Open Source |
| .STL | 3D Systems | CAD Files | Stereolithography File | MeshLab | Open Source |
| .STM | Microsoft Corporation | Data Files | Exchange Streaming Media File | CocoModX | Open Source |
| .STP | Unknown Developer | 3D Image Files | STEP 3D CAD File | FreeCAD | Open Source |
| .STR | dBase, LLC | Data Files | dBASE Structure List Object File | PSMplay | Open Source |
| .STX | Unknown Developer | Audio Files | Scream Tracker Music Interface Kit File | CocoModX | Open Source |
| .STY | Jørgen Sørensen / Jososoft | Audio Files | Yamaha/Korg Keyboard Style | TEXnicCenter | Open Source |
| .SUB | URUWORKS | Text Files | Subtitle File | Universal Subtitle Viewer | Open Source |
| .SUITE | Stardock Corporation | Settings Files | Stardock WinStyles Suite | ZipZag | Open Source |
| .SUJ | Open Source | Data Files | Stacker Unlimited Job | Stacker Unlimited | Open Source |
| .SUN | Sun Microsystems | Raster Image Files | Sun Raster Graphic File | IrfanView | Open Source |
| .SUP | Unknown Developer | Raster Image Files | Subtitle Bitmap File | IfoEdit | Open Source |
| .SV6 | Chris Sawyer | Game Files | RollerCoaster Tycoon 2 Saved Game | OpenRCT2 | Open Source |
| .SV7 | Nintendo | Game Files | Saved Game File | DeSmuME | Open Source |
| .SVG | Nintendo | Game Files | Saved Game File | DeSmuME | Open Source |
| .SVH | IEEE Xplore | Developer Files | SystemVerilog Source Code Header File | Notepad2 | Open Source |
| .SVS | Nintendo | Game Files | Game Boy Advance Saved State File | XWE | Open Source |
| .SVT | Runic Games | Game Files | Torchlight Saved Game File | TorchTools | Open Source |
| .SWF | Adobe Systems Incorporated | Video Files | Shockwave Flash Movie | Media Player Classic | Open Source |
| .SWM | Microsoft Corporation | Disk Image Files | Split Windows Imaging Format File | ExtractNow | Open Source |
| .SWP | Microsoft Corporation | System Files | Swap File | gVim | Open Source |
| .SXT | FMJ-Software | Audio Files | Propellerheads Reason 2 NN-XT Sound Data | Dragon UnPACKer | Open Source |
| .SYM | The Eclipse Foundation | Developer Files | Symbols File | GDB | Open Source |
| .SYSTEM | Open Source | Game Files | Vega Strike Virtual System File | gVim | Open Source |
| .SZX | Open Source | Data Files | Spectaculator ZX-State Snapshot | Spectaculator | Open Source |
| .T64 | Commodore International | Disk Image Files | Commodore 64 Tape Image File | VICE | Open Source |
| .TAP | Various Developers | Disk Image Files | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TAR | Jean-loup Gailly and Mark Adler | Data Files | Consolidated Unix File Archive | PeaZip | Open Source |
| .TBN | Open Source | Raster Image Files | Kodi Thumbnail Image | Kodi | Open Source |
| .TBX | Simple DirectMedia Layer (SDL) | Data Files | SDL Trados Studio Glossary Data | PSPad | Open Source |
| .TBZ2 | Winrar | Compressed Files | Tar BZip 2 Compressed File | PeaZip | Open Source |
| .TCL | Open Source | Developer Files | Tcl Script | PSPad | Open Source |
| .TCM | IMSI/Design, LLC | CAD Files | TurboCAD Mac Drawing | PSPad | Open Source |
| .TEX | Open Source | Text Files | LaTeX Source Document | gVim | Open Source |
| .TGM | Open Source | 3D Image Files | Nem's Mega 3D Terrain Generator | Nem's Mega 3D Terrain Generator | Open Source |
| .TGT | Corel | Data Files | Corel Custom Data | Watcom C/C++ | Open Source |
| .TH | Open Source | GIS Files | Therion Data File | Therion | Open Source |
| .THM | Sony | Uncommon Files | Sony Ericsson Mobile Phone Theme File | IrfanView | Open Source |
| .THOR | Sublime HQ Pty Ltd | Developer Files | Thor Source Code | PSPad | Open Source |
| .THX | Cloanto Corporation | Audio Files | Amiga THX Tracker Music File | CocoModX | Open Source |
| .TI | timber-lang.org | Developer Files | Timber Compiler | Open Turing | Open Source |
| .TIF | XnSoft | Raster Image Files | Tagged Image File Format | IrfanView | Open Source |
| .TIFF | XnSoft | Raster Image Files | Tagged Image File Format | IrfanView | Open Source |
| .TIG | Texas Instruments, Inc. | Backup Files | TI Connect Backup File | COREX | Open Source |
| .TIM | Sierra Entertainment | Game Files | The Incredible Machine Level | Vixen Lights | Open Source |
| .TK | Procedimientos-Uno, S.L. | Data Files | TeKton3D Project | Tclsh | Open Source |
| .TLD | The Eclipse Foundation | Developer Files | Tag Library Descriptor File | NetBeans | Open Source |
| .TLL | LG Electronics | Settings Files | LG TV Link-Loader File | ChanSort | Open Source |
| .TOD | JVCKenwood Group | Video Files | JVC Everio Video Capture File | Squared 5 MPEG Streamclip | Open Source |
| .TODO | Open Source | Text Files | Simple Project ToDo Database | Simple Project ToDo | Open Source |
| .TOM | Aptora | Data Files | Total Office Manager Accounting Data | PSPad | Open Source |
| .TORRENT | BitTorrent | Uncommon Files | BitTorrent Information File | Shareaza | Open Source |
| .TP2 | Unknown Developer | Data Files | WeiDU Resource Pack File | WeiDU | Open Source |
| .TPF | IBM | Settings Files | SPSS Text Wizard Document | TexMod | Open Source |
| .TPR | Pegasys | Video Files | TMPGEnc Project File | Media Player Classic | Open Source |
| .TPZ | Amazon | eBook Files | Kindle Topaz eBook File | Calibre | Open Source |
| .TR | Yadabyte | eBook Files | TomeRaider 2 eBook File | ISOLINUX | Open Source |
| .TRI | Singular Inversions | 3D Image Files | FaceGen Polygonal Model File | AbiWord | Open Source |
| .TRK | TwoNav | Data Files | CompeGPS Land Track File | GPSBabel | Open Source |
| .TRP | VSO Software | Video Files | MPEG-2 HD Video Transport Stream | SMPlayer | Open Source |
| .TS | Various Developers | Video Files | Video Transport Stream File | Squared 5 MPEG Streamclip | Open Source |
| .TS2 | Open Source | Data Files | Time Stamp Project Information File | Time Stamp | Open Source |
| .TSK | Microsoft Corporation | Settings Files | Pocket PC Skin | Task Coach | Open Source |
| .TSO | Siemens AG | 3D Image Files | NX2 File 3D Faceted Spacial Volume Data | TSO Editor | Open Source |
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