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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .S1H | Oracle Corporation | Web Files | Sealed HTML Document | Unknown Software | Unknown Developer |
| .SCSS | Sublime HQ Pty Ltd | Web Files | Syntactically Awesome Stylesheets Syntax Data | Adobe Dreamweaver | Adobe Systems Incorporated |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | LibreOffice | The Document Foundation |
| .SHTML | Sublime HQ Pty Ltd | Web Files | Server Side Include HTML File | Microsoft Notepad | Microsoft Corporation |
| .SITE | Adobe Systems Incorporated | Web Files | GoLive Website Project File | Adobe GoLive | Adobe Systems Incorporated |
| .SITEMAP | Microsoft Corporation | Web Files | ASP.NET Site Map File | Microsoft Visual Studio | Microsoft Corporation |
| .SPAM | Unknown Developer | Web Files | Spam E-mail Message | Unknown Software | Unknown Developer |
| .SPC | Various Developers | Web Files | Software Publisher Certificate File | OpenSSL | Open Source |
| .SPM | Corel | Web Files | Corel WordPerfect Data | Corel WordPerfect | Corel |
| .SRF | NewTek | Web Files | LightWave Surface File | LightWave 3D | NewTek |
| .SSH | Microsoft Corporation | Web Files | Microsoft Internet Explorer Style Sheet | Internet Explorer | Microsoft Corporation |
| .SSP | Scala | Web Files | Scala Server Page | Scalate | Open Source |
| .STC | Adobe Systems Incorporated | Web Files | Contribute Connection Key File | Adobe Contribute 6.5 | Adobe Systems Incorporated |
| .STL | 3D Systems | Web Files | Stereolithography File | Creo Parametric 3D Modeling Software | PTC |
| .STM | Microsoft Corporation | Web Files | Exchange Streaming Media File | Microsoft Exchange Server | Microsoft Corporation |
| .STP | Unknown Developer | Web Files | STEP 3D CAD File | CATIA | Dassault Systèmes |
| .SVC | Microsoft Corporation | Web Files | WCF Web Service File | Microsoft Internet Information Services (IIS) | Microsoft Corporation |
| .SVR | Superscape | Web Files | Compressed Virtual World | Safari | Apple |
| .SWZ | Adobe Systems Incorporated | Web Files | Adobe Flash Player Cache File | Adobe Flash Player | Adobe Systems Incorporated |
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