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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .S3D | Micrografx | Graphic Files | Micrografx Simply 3D Project File | Micrografx Simply 3D | Micrografx |
| .SAF | DeLorme | Graphic Files | Street Atlas USA Map File | DeLorme Street Atlas USA | DeLorme |
| .SAIF | Safe Software | Graphic Files | Spatial Archive Interchange Format | Unknown Software | Unknown Developer |
| .SAN | LucasArts Entertainment Company, LLC | Graphic Files | Smush Animation File | Star Wars: Rebel Assault | LucasArts Entertainment Company, LLC |
| .SBL | Adobe Systems Incorporated | Graphic Files | Shockwave Flash Object | Adobe Flash Player | Adobe Systems Incorporated |
| .SDP | Oracle Corporation | Graphic Files | StarOffice Presentation File | Apache OpenOffice | Apache Software Foundation |
| .SGN | Signet Bureau | Graphic Files | Signet Bureau DRM File | SGN Viewer | Signet Bureau |
| .SGR | Electronic Arts | Graphic Files | SimCity 4 Graphics Rules File | Electronic Arts SimCity 4 | Electronic Arts |
| .SGV | Oracle Corporation | Graphic Files | StarOffice StarDraw 2.0 Picture Image File | StarOffice | Oracle Corporation |
| .SHA | Corel | Graphic Files | CorelDraw Shader File | CorelDRAW Graphics Suite | Corel |
| .SHO | Show Pro Software | Graphic Files | Show Pro Show Flow File | Show Pro | Show Pro Software |
| .SIA | Nevercenter | Graphic Files | Silo 3D Model File | Silo | Nevercenter |
| .SLB | Autodesk, Inc. | Graphic Files | AutoCAD Slide Library | Autodesk AutoCAD | Autodesk, Inc. |
| .SLDLFP | Dassault Systèmes | Graphic Files | SolidWorks Library Part | Dassault Systemes SolidWorks | Dassault Systèmes |
| .SLO | Pixar | Graphic Files | RenderMan Compiled File | RenderMan | Pixar |
| .SLP | Magix Software GmbH | Graphic Files | SpectraLayers Pro Project | SpectraLayers Pro | Magix Software GmbH |
| .SLT | Mozilla | Graphic Files | Mozilla User Profile Folder | Mozilla Firefox | Mozilla |
| .SMG | Dassault Systèmes | Graphic Files | 3DVia Composer Model | 3DVIA | Dassault Systèmes |
| .SMH | Oracle Corporation | Graphic Files | Sealed MHT Document | Unsealer | Oracle Corporation |
| .SMI | Apple | Graphic Files | Self-Mounting Disk Image | ShrinkWrap | Aladdin Systems |
| .SMIL | "Synchronized Multimedia" Working Group (SYMM WG) | Graphic Files | SMIL(Synchronized Multimedia Integration Language) Presentation File | Internet Explorer | Microsoft Corporation |
| .SNA | Tom Ehlert Software | Graphic Files | Drive Snapshot Primary Backup File | Tom Ehlert Drive Snapshot | Tom Ehlert Software |
| .SST | Microsoft Corporation | Graphic Files | Serialized Certificate Store File | Certificate Manager Tool | Microsoft Corporation |
| .ST6 | XnSoft | Graphic Files | SBIG CCD Camera Image | XnView MP | XnSoft |
| .ST7 | XnSoft | Graphic Files | SBIG CCD Camera Image | XnView MP | XnSoft |
| .ST9 | XnSoft | Graphic Files | SBIG CCD Camera Image | XnView MP | XnSoft |
| .STD | Oracle Corporation | Graphic Files | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STM | Microsoft Corporation | Graphic Files | Exchange Streaming Media File | Microsoft Exchange Server | Microsoft Corporation |
| .SWL | Macromedia | Graphic Files | Alternate Macromedia Flash Format | Adobe Flash Player | Adobe Systems Incorporated |
| .SXO | Modular Dreams, Inc. | Graphic Files | SX Paint Saved Graphical Working Environment | SX Paint | Modular Dreams, Inc. |
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