| .SAF | DeLorme | GIS filer | Street Atlas USA Map File | DeLorme Street Atlas USA | DeLorme |
| .SBN | ESRI | GIS filer | ESRI Spatial Binary File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SBP | Autodesk, Inc. | GIS filer | Sketchbook Express iCloud Image | SketchBook | Autodesk, Inc. |
| .SDC | Stardock Corporation | GIS filer | Stardock Central Download Archive | Stardock Central | Stardock Corporation |
| .SDF | Microsoft Corporation | GIS filer | SQL Server Compact Database File | Microsoft Visual Studio | Microsoft Corporation |
| .SDI | Intuit, Inc. | GIS filer | QuickBooks Data File | Intuit QuickBooks Pro | Intuit, Inc. |
| .SDM | Oracle Corporation | GIS filer | StarOffice Mail Message | StarOffice | Oracle Corporation |
| .SDW | LizardTech | GIS filer | MrSID World File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SHP | Autodesk, Inc. | GIS filer | AutoCAD Shape File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .SLD | ESRI (Environmental Systems Research Institute) | GIS filer | Styled Layer Descriptor | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SMM | Samsung Electronics | GIS filer | Samsung Memo File | Samsung Kies | Samsung Electronics |
| .SMP | MakeMusic, Inc. | GIS filer | SmartMusic Performance File | SmartMusic | MakeMusic, Inc. |
| .SOS | 3AM Solutions | GIS filer | Dynamite VSP Swept Object Style File | Dynamite VSP | 3AM Solutions |
| .SSF | Unknown Developer | GIS filer | Structured Subtitle Format File | Microsoft Notepad | Microsoft Corporation |
| .STN | ON1, Inc. | GIS filer | Genuine Fractals Image | Adobe Photoshop | Adobe Systems Incorporated |
| .STT | Microsoft Corporation | GIS filer | Streets & Trips Map Template | Microsoft AutoRoute | Microsoft Corporation |
| .STYLE | Trimble Inc. | GIS filer | SketchUp Style | SketchUp | Trimble Inc. |
| .SVX | The Survex Project | GIS filer | Survex Cavern Data File | Microsoft Notepad | Microsoft Corporation |
| .SXD | ESRI | GIS filer | ArcScene Document | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SXF | KB Panorama | GIS filer | Storage And eXchange Format File | GIS Panorama | KB Panorama |
| .SYM | The Eclipse Foundation | GIS filer | Symbols File | Eclipse CDT | The Eclipse Foundation |
| .TAB | Microsoft Corporation | GIS filer | Tab Separated Data File | Microsoft Excel | Microsoft Corporation |
| .TAT | ESRI (Environmental Systems Research Institute) | GIS filer | ESRI Geographic Text Attribute Table | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TFW | ESRI | GIS filer | World File For TIFF | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TGR | The U.S. Census Bureau | GIS filer | Tiger Line Data | Unknown Software | Unknown Developer |
| .TH | Open Source | GIS filer | Therion Data File | Therion | Open Source |
| .TIC | ESRI | GIS filer | ArcInfo Coordinates File | ArcInfo | ESRI |
| .TIMESTAMP | ESRI | GIS filer | Geodatabase Timestamp File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TPQ | National Geographic maps | GIS filer | TOPO!Pro Map File | TOPO software | National Geographic maps |
| .TPX | DeLorme | GIS filer | DeLorme Topo Project File | Topo North America | Interscape |
| .TRG | Symantec Corporation | GIS filer | Symantec LiveUpdate File | Norton SystemWorks | Symantec Corporation |
| .TRP | VSO Software | GIS filer | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TSO | Siemens AG | GIS filer | NX2 File 3D Faceted Spacial Volume Data | Siemens PLM NX | Siemens PLM Software |
| .TWF | ESRI | GIS filer | ArcView World Coordinates | ArcView | ESRI |
| .TWL | Open Source | GIS filer | Naviguide Binary GPS Track Data File | GPSBabel | Open Source |
| .UBX | u-blox | GIS filer | U-center UBX GPS Log Data | u-center | u-blox |
| .USR | FileMaker Inc. | GIS filer | FileMaker Pro Database File | FileMaker Pro | FileMaker Inc. |
| .VCT | Clark Labs | GIS filer | IDRISI Vector Image | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .VDC | Clark Labs | GIS filer | IDRISI Vector Documentation File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .VEC | Omron Corporation | GIS filer | CX-Designer Shape File | OMRON CX-One | Omron Corporation |
| .VPF | Interscape | GIS filer | Vector Product Format | H2OMAP Water | Interscape |
| .VRC | Augmentra Ltd | GIS filer | ViewRanger Map File | ViewRanger | Augmentra Ltd |
| .VRH | Augmentra Ltd | GIS filer | ViewRanger Map File | ViewRanger | Augmentra Ltd |
| .VRM | Augmentra Ltd | GIS filer | ViewRanger Map File | ViewRanger | Augmentra Ltd |
| .VTM | Adobe Systems Incorporated | GIS filer | Visual Tool Markup Language Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .VYK | GEPRO spol. s ro | GIS filer | GEPRO MISYS Data | MISYS | GEPRO spol. s ro |
| .WFD | Turtle Beach Corporation | GIS filer | WaveFront Drum Kit File | Turtle Beach WaveFront Software | Turtle Beach Corporation |
| .WKB | Corel | GIS filer | Corel WordPerfect Document | Corel WordPerfect | Corel |
| .WOR | Pitney Bowes | GIS filer | MapInfo Workspace File | MapInfo Professional | Pitney Bowes |
| .WPT | Corel | GIS filer | WordPerfect Template | Corel WordPerfect X8 | Corel |
| .XCM | Institute for Human and Machine Cognition (IHMC) | GIS filer | CmapTools Exported Concept Map | IHMC CmapTools | Institute for Human and Machine Cognition (IHMC) |
| .ZLAS | ESRI (Environmental Systems Research Institute) | GIS filer | ESRI Optimized LiDAR File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
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