| tab | MapInfo Table Document |
| tat | ArcView Text Attribute Table |
| ter | Map Maker Terrain File |
| tfw | ArcGIS TIFF World File |
| tifw | ArcGIS TIFF World File |
| timestamp | ArcGIS Geodatabase Timestamp File |
| tlw | TripLogik TL1000 RAW Data |
| tpk | ArcGIS Tile Data Package |
| tpo | Topo Explorer Map |
| tqm | Traqmate Data File |
| trip | Garmin Nuvi Trip Data |
| tro | Visual Topo Document |
| tsd | TNTmips TileSet Definition Data |
| ttkgp | TatukGIS Project |
| ttmd | Trail Tracker GPS Map Data |
| twl | Naviguide Binary GPS Track Data |
| twz | TerraGo Collaboration Package |
| tzd | TimeZero Exchange Data |
| ubx | UBX GPS Log Data |
| ulf | Universal List File |
| upi | Sygic Drive POI Database |
| vct | Idrisi Vector Image |
| vdc | Idrisi Vector Documentation |
| vec | Idrisi Vector |
| vec | ENVI Vector Template |
| vfk | Czech Cadastral Exchange Data Format Data |
| vmap | CompeGPS Vectorial Map |
| vpf | Vector Product Format Data |
| vrt | GDAL Virtual Format |
| vtpx | ArcGIS Pro Vector Tile Package |
