| sup | SOCET SET Support File |
| svy | AGPS-Shape Pro Data Point |
| sxd | ArcScene Document |
| sxf | GIS Storage and eXchange Format File |
| sxw | SuperMap Desktop GIS XML Workspace |
| sxwu | SuperMap Desktop GIS 6R XML Workspace |
| tab | GPS Pathfinder Office Station or Session Table |
| tab | MapInfo Table Document |
| tat | ArcView Text Attribute Table |
| tbx | ArcGIS Desktop Toolbox Data |
| tdmb | Trimble Outdoors Navigator Map Bundle Data |
| ter | Map Maker Terrain File |
| tfw | ArcGIS TIFF World File |
| tfw | MrSID World Data |
| tfwx | ArcGIS Approximate Affine Transformation Data |
| 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 |
| trk | CompeGPS Land Track Data |
| trk | Fugawi Tracklog Data |
| trk | SeeYou Track Data |
| trl | Alan MAP 500 Tracklog |
| tro | Visual Topo Document |
| tsd | TNTmips TileSet Definition Data |
| ttbin | TomTom Adventurer Route Data |
| ttkgp | TatukGIS Project |
