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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .S2S | CED (Cambridge Electronics designs) | Text Files | Spike2 Script File | Spike2 | CED (Cambridge Electronics designs) |
| .S5D | Siemens AG | Text Files | Siemens Step 5 Source Code File | Step5 | Siemens AG |
| .SA6 | DeLorme | Text Files | Street Atlas Ver. 6 Map Document | DeLorme Street Atlas USA | DeLorme |
| .SAF | DeLorme | Text Files | Street Atlas USA Map File | DeLorme Street Atlas USA | DeLorme |
| .SAM | Microsoft Corporation | Text Files | LMHOSTS Sample File | Notepad++ | Don Ho |
| .SAVE | Unknown Developer | Text Files | Nano Temporary Save File | GNU nano | Open Source |
| .SCC | Microsoft Corporation | Text Files | SourceSafe Source Code Control File | Microsoft Visual Studio | Microsoft Corporation |
| .SCM | Gimpel Software | Text Files | GIMP Script-Fu Script | GIMP | The GIMP Development Team |
| .SCT | Scitex | Text Files | Scitex Continuous Tone File | Adobe Photoshop | Adobe Systems Incorporated |
| .SCW | Genie | Text Files | Score Writer Document | GenieSoft Score Writer | Genie |
| .SDM | Oracle Corporation | Text Files | StarOffice Mail Message | StarOffice | Oracle Corporation |
| .SDOC | Samsung Electronics | Text Files | Samsung Memo File | Samsung Kies | Samsung Electronics |
| .SDW | LizardTech | Text Files | MrSID World File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SE | Unknown Developer | Text Files | Shuttle Document | Microsoft Notepad | Microsoft Corporation |
| .SESSION | Dassault Systèmes | Text Files | CATIA 4 Session File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .SFP | Troy | Text Files | Soft Font Printer File | TROY Printer Utility | Troy |
| .SGM | VBA Team | Text Files | VisualBoyAdvance Saved Game | VisualBoyAdvance | VBA Team |
| .SHF | Symantec Corporation | Text Files | Pretty Good Privacy (PGP) Share | Pretty Good Privacy (PGP) | Symantec Corporation |
| .SIG | Unknown Developer | Text Files | Signature File | Microsoft Outlook Express | Microsoft Corporation |
| .SL | SourceForge | Text Files | Unix Software License File | Vi | SourceForge |
| .SLA | Open Source | Text Files | Scribus Document | Scribus | Open Source |
| .SLF | Symantec Corporation | Text Files | Symantec License File | Symantec Ghost Solution Suite | Symantec Corporation |
| .SM | Open Source | Text Files | StepMania Song File | StepMania | Open Source |
| .SMF | Oracle Corporation | Text Files | StarMath Formula File | Apache OpenOffice | Apache Software Foundation |
| .SMH | Oracle Corporation | Text Files | Sealed MHT Document | Unsealer | Oracle Corporation |
| .SMS | Sega | Text Files | Sega Master System ROM | Kega Fusion | Steve Snake |
| .SOD | id Software | Text Files | Spear Of Destiny Data File | Spear of Destiny | id Software |
| .SPN | Corel | Text Files | Corel WordPerfect Distribution Definition | Corel WordPerfect | Corel |
| .SSA | Open Source | Text Files | Sub Station Alpha Subtitle File | VirtualDub | Open Source |
| .SSC | Microsoft Corporation | Text Files | SourceSafe Status File | Microsoft Visual Studio | Microsoft Corporation |
| .ST1 | Converge Horizons | Text Files | DigiTitle Master Subtitle File | DigiTitle Master | Converge Horizons |
| .STORY | Storyist Software | Text Files | Storyist Document | Storyist | Storyist Software |
| .STQ | StatSoft, Inc. | Text Files | Statistica Text File | STATISTICA | StatSoft, Inc. |
| .STRINGS | Apple | Text Files | Text Strings File | MacroMates TextMate | MacroMates |
| .STW | Oracle Corporation | Text Files | StarOffice Document Template | Apache OpenOffice | Apache Software Foundation |
| .STY | Jørgen Sørensen / Jososoft | Text Files | Yamaha/Korg Keyboard Style | Style Fixer | Jørgen Sørensen / Jososoft |
| .SUB | URUWORKS | Text Files | Subtitle File | CyberLink PowerDVD | CyberLink |
| .SUBTITLE | Pegasys | Text Files | TMPGEnc Subtitle File | TMPGEnc | Pegasys |
| .SWX | Apache Software Foundation | Text Files | OpenOffice.org 1.0 Text Document | Apache OpenOffice | Apache Software Foundation |
| .SXG | Oracle Corporation | Text Files | Apache OpenOffice Master Document | Apache OpenOffice | Apache Software Foundation |
| .SXW | Oracle Corporation | Text Files | StarOffice Writer Document | Apache OpenOffice | Apache Software Foundation |
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