| 131. | .tre | Directory tree file (PC-Tools) ◊ ECS/HDS hierarchy tree |
| 132. | .trif | Tiled Raster Interchange Format Bitmap graphics |
| 133. | .trk | Script file (Kermit) ◊ Track (i.e. video sequence) used by many games |
| 134. | .trm | Terminal settings (Windows 3.x) |
| 135. | .trn | Project usage log (MKS Source Integrity) ◊ Translation support file (Quattro - Clarion) |
| 136. | .trs | Executable file (Micrografx) |
| 137. | .tru | True Basic language source code file |
| 138. | .trw | Session-state settings (Turbo Debugger for Windows) |
| 139. | .tsm | Manual (Turbo Assembler for OS/2) |
| 140. | .tsq | ODBC script |