| tpr | GROMACS Portable Binary Input File |
| tps | RFM Total Internal Partition Sums File |
| tps | Clarion TopSpeed Database |
| tpt | PCLTool Transformation Parameter Table |
| tpzu | Treepad Icon Library Update |
| tq | STK Torque File |
| tqx | NZ Infoshare Table Query File |
| tqz | TurningPoint QuestionPoint Data File |
| tr | CIRS Transaction Data |
| tr1 | IBM VoiceType Data File |
| tr5 | OnyxTree Professional Data |
| tra | WinTrack Railroad Track |
| tra | RFM Transmission Spectrum File |
| trace | VMware ThinApp Binary Trace Log |
| trak | NI Traktor Pak File |
| traw | PLINK Variant-major Additive Component File |
| tray | Corel CONNECT Tray |
| trb | HP Printer Diagnostic Package |
| trbw | STAR-CCM+ TurboWizard File |
| trd | TrID Definitions Package |
| tree | Es-Builder v3 Tree File |
| trf | BrainVoyager QX Transformations Data |
| trf | LFToolkit Transformation Rules File |
| trg | SQL Script Triggers |
| tri | Ribbons Triangle Definition |
| trk | STAR-CD v4 Droplet Track Data |
| trk | Garmin GPS PCX5 Tracklog |
| trk | MakeMusic Finale Track/Staff Mapping File |
| trl | Holux GM-101 Tracklog |
| trl | Topocad Roadlines |
