| Extension | File Description |
| .TONER | Uncommon Files |
| .TONES | Uncommon Files |
| .TOO | Uncommon Files |
| .TOOL | Uncommon Files |
| .TOOL219 | Uncommon Files |
| .TOOLBOX | Uncommon Files |
| .TOOLS | Uncommon Files |
| .TOP | Data Files |
| .TOPAZ3D | Uncommon Files |
| .TOPC | Data Files |
| .TOPICS | Uncommon Files |
| .TOQ | Uncommon Files |
| .TOR | Game Files |
| .TORNADOS | Uncommon Files |
| .TORRENT | Misc Files |
| .TOS | Uncommon Files |
| .TOT | Uncommon Files |
| .TOU | Uncommon Files |
| .TOUR | Uncommon Files |
| .TOUR-PROJE | Uncommon Files |
| .TOURNARIE1 | Uncommon Files |
| .TOURNARIE2 | Uncommon Files |
| .TOURNARIE3 | Uncommon Files |
| .TOV | Uncommon Files |
| .TOW | Uncommon Files |
| .TOWER | Uncommon Files |
| .TOX | Uncommon Files |
| .TOY | Uncommon Files |
| .TOZ | Uncommon Files |
| .TO_BE_DELE | Uncommon Files |
| .TP | Video Files |
| .TP0 | Uncommon Files |
| .TP1 | Uncommon Files |
| .TP2 | Uncommon Files |
| .TP3 | Page Layout Files |
| .TP4 | Game Files |
| .TP5 | Uncommon Files |
| .TP6 | Uncommon Files |
| .TP7 | Uncommon Files |
| .TP8 | Uncommon Files |
| .TP9 | Uncommon Files |
| .TPA | Uncommon Files |
| .TPB | Data Files |
| .TPC | Text Files |
| .TPD | Video Files |
| .TPE | Uncommon Files |
| .TPF | Data Files |
| .TPG | Uncommon Files |
| .TPH | Uncommon Files |
| .TPI | Plugin Files |
| .TPJ | Uncommon Files |
| .TPK | Uncommon Files |
| .TPL | Misc Files |
| .TPM | Misc Files |
| .TPN | Uncommon Files |
| .TPO | Uncommon Files |
| .TPP | Uncommon Files |
| .TPQ | Uncommon Files |
| .TPR | Video Files |
| .TPS | Data Files |
| .TPT | Uncommon Files |
| .TPU | Developer Files |
| .TPV | Uncommon Files |
| .TPW | Uncommon Files |
| .TPX | Developer Files |
| .TPY | Uncommon Files |
| .TPZ | Data Files |
| .TQ0 | Uncommon Files |
| .TQ1 | Uncommon Files |
| .TQ2 | Uncommon Files |
| .TQ3 | Uncommon Files |
| .TQ4 | Uncommon Files |
| .TQ5 | Uncommon Files |
| .TQ6 | Uncommon Files |
| .TQ7 | Uncommon Files |
| Extension | File Description |
| .TQ8 | Uncommon Files |
| .TQ9 | Uncommon Files |
| .TQA | Uncommon Files |
| .TQB | Uncommon Files |
| .TQC | Uncommon Files |
| .TQD | Uncommon Files |
| .TQE | Uncommon Files |
| .TQF | Uncommon Files |
| .TQG | Uncommon Files |
| .TQH | Uncommon Files |
| .TQI | Uncommon Files |
| .TQJ | Uncommon Files |
| .TQK | Uncommon Files |
| .TQL | Uncommon Files |
| .TQM | Uncommon Files |
| .TQN | Uncommon Files |
| .TQO | Uncommon Files |
| .TQP | Uncommon Files |
| .TQQ | Uncommon Files |
| .TQR | Uncommon Files |
| .TQS | Uncommon Files |
| .TQT | Uncommon Files |
| .TQU | Uncommon Files |
| .TQV | Uncommon Files |
| .TQW | Uncommon Files |
| .TQX | Uncommon Files |
| .TQY | Uncommon Files |
| .TQZ | Uncommon Files |
| .TR | Data Files |
| .TR0 | Uncommon Files |
| .TR1 | Uncommon Files |
| .TR2 | Uncommon Files |
| .TR3 | Data Files |
| .TR4 | Uncommon Files |
| .TR5 | Uncommon Files |
| .TR6 | Uncommon Files |
| .TR7 | Uncommon Files |
| .TR8 | Uncommon Files |
| .TR9 | Uncommon Files |
| .TRA | Data Files |
| .TRACE | Misc Files |
| .TRACING | Uncommon Files |
| .TRACK0 | Uncommon Files |
| .TRACKER | Uncommon Files |
| .TRACKER2 | Uncommon Files |
| .TRACKS | Uncommon Files |
| .TRADALOG | Uncommon Files |
| .TRADE | Uncommon Files |
| .TRANS | Uncommon Files |
| .TRASHINFO | Uncommon Files |
| .TRAVEL | Uncommon Files |
| .TRB | Uncommon Files |
| .TRC | Database Files |
| .TRD | Data Files |
| .TRE | Uncommon Files |
| .TREE | Uncommon Files |
| .TREK | Uncommon Files |
| .TRF | Uncommon Files |
| .TRG | Uncommon Files |
| .TRH | Uncommon Files |
| .TRI | 3D Image Files |
| .TRIAL | Uncommon Files |
| .TRIANG | Uncommon Files |
| .TRIF | Raster Image Files |
| .TRIPPER | Uncommon Files |
| .TRIX | Uncommon Files |
| .TRJ | Uncommon Files |
| .TRK | Game Files |
| .TRK3 | Uncommon Files |
| .TRL | Uncommon Files |
| .TRM | Data Files |
| .TRN | Backup Files |
| .TRO | Uncommon Files |
| .TROFF | Text Files |
| .TRP | Video Files |
