| stn | ArcView Geocoding Standardization |
| strk | GeoLogger GPS Track Data |
| stx | ArcView Statistics Data |
| style | ArcGIS Desktop Style Data |
| style | ArcGIS Style File |
| stylx | ArcGIS Desktop Pro v2 Style Data |
| sua | SeeYou Airspace Data |
| 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 |
| sym | TatukGIS Symbols Data |
| 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 |
| tpl | TatukGIS Editor Print Template |
| tpo | Topo Explorer Map |
| tqm | Traqmate Data File |
