| 161. | .twf | Data (TabWorks) |
| 162. | .tww | Tagwrite Template |
| 163. | .tx8 | 8-bit ASCII text |
| 164. | .txb | Encoded briefing file (Descent/D2) |
| 165. | .txf | Compressed file archive.tar.f (tar and Freeze) ◊ Tax exchange format (Quicken) |
| 166. | .txi | Support file (TeX) |
| 167. | .txt | Plain text, usually human readable (ASCII or ISO Latin 1 format) ◊ Sound (Ascii Text formatted audio data) |
| 168. | .txw | Yamaha TX-16W Wave File (Convert (c) Villena) |
| 169. | .tym | Time Stamp (PageMaker 4) |
| 170. | .tz | Compressed file archive.tar.Z (tar and compress) |
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