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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .TAB | Microsoft Corporation | GIS Files | Tab Separated Data File | Microsoft Excel | Microsoft Corporation |
| .TAT | ESRI (Environmental Systems Research Institute) | GIS Files | ESRI Geographic Text Attribute Table | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TFW | ESRI | GIS Files | World File For TIFF | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TGR | The U.S. Census Bureau | GIS Files | Tiger Line Data | Unknown Software | Unknown Developer |
| .TH | Open Source | GIS Files | Therion Data File | Therion | Open Source |
| .TIC | ESRI | GIS Files | ArcInfo Coordinates File | ArcInfo | ESRI |
| .TIMESTAMP | ESRI | GIS Files | Geodatabase Timestamp File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .TPQ | National Geographic maps | GIS Files | TOPO!Pro Map File | TOPO software | National Geographic maps |
| .TPX | DeLorme | GIS Files | DeLorme Topo Project File | Topo North America | Interscape |
| .TRG | Symantec Corporation | GIS Files | Symantec LiveUpdate File | Norton SystemWorks | Symantec Corporation |
| .TRP | VSO Software | GIS Files | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TSO | Siemens AG | GIS Files | NX2 File 3D Faceted Spacial Volume Data | Siemens PLM NX | Siemens PLM Software |
| .TWF | ESRI | GIS Files | ArcView World Coordinates | ArcView | ESRI |
| .TWL | Open Source | GIS Files | Naviguide Binary GPS Track Data File | GPSBabel | Open Source |
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