| 71. | .thn | Thumbnail (Graphics Workshop for Windows) |
| 72. | .thor | Database description (THOR database) |
| 73. | .ths | Thesaurus dictionary (WordPerfect) |
| 74. | .thx | Music (Amiga THX Tracker) |
| 75. | .ti | Temporary Instruction (NRC Inspection Manual) |
| 76. | .tic | FTN special file with assotiated file description (ALLFIX) |
| 77. | .tif | Bitmap graphics (Tagged Image File Format) |
| 78. | .tiff | Bitmap graphics (Tagged Image File Format) |
| 79. | .tig | Tiger file (US government distributed maps) |
| 80. | .til | Fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler) |
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