| trl | Topocad Roadlines Data |
| trll | Topocad Length Table Data |
| trm | eSignal Trade Manager Data |
| trm | Oracle Trace Map Data |
| trm8 | Avantes Avasoft v8 Transmittance Mode Data |
| trn | CFX Transient File |
| trn | Corel Quattro Pro Translation Support Data |
| trn | Medlin Payroll Software Current Year Transactions Data |
| trn | MegaHAL Training Data |
| trn | Microsoft SQL Server Transaction Log |
| trn | Oracle Documaker Transaction Data |
| trn | PTC Creo Turning Parameter Data |
| trn | STN Express Transcript Text |
| trn | TextBridge Pro Trainging Data |
| tro | IBM Voice Type Data |
| trp | EPLRS Network Activity Logging Trap |
| trp | MotionTracking Track Search Parameters Data |
| trp | Topocad Road Profile |
| trp | TrimeTool TRP Output |
| trp | TripMaker Document |
| trr | GROMACS Trajectory File |
| trs | Table Retrieval System Document |
| trs | TrIDNet Serialized Definitions Package |
| trs | WinTrack Railroad Track Text Data |
| trt | DLocalizer Translations Data |
| trt | Team Sports Scheduling System Report Template |
| truck | Rigs of Rods Truck Description File |
| trv | Topocad Traverse Document |
| trx | SDL Passolo Translation List |
| trx | WebAuthorize Batch Data |
