| tlsd | Digitech Trio Plus Sample Data |
| tm8 | Theta Music Composer v1 Audio |
| tmc | Theta Music Composer v1 Audio |
| tpw | TutorPro Packed Wave Data |
| truehd | Dolby TrueHD Audio Stream |
| tsh | Cenix True Speech HQ Audio |
| tsl | Cenix True Speech LQ Audio |
| tsp | TrueSpeech Compressed Audio |
| tta | True-Audio Compressed Audio |
| tvd | Yamaha Tyros 2 Custom Drum Voice |
| tvn | Yamaha Tyros 2 Voice Data |
| twv | VCM-ROM Linker Voice Data |
| txt | Steinberg LM-4 Audio Bank Data |
| txw | Yamaha TX16W Audio |
| u | AU Audio |
| ub | Unsigned Byte Audio |
| udw | Raw Unsigned DoubleWord Audio |
| ul | U-Law Compressed Audio File |
| ulaw | U-Law Compressed Audio File |
| ult | UltraTracker Music Module |
| ulw | U-Law Compressed Audio File |
| uni | MikMod UniMOD Music Module |
| unic | UNIC Tracker Sound Module |
| userkit | DrumCore Audio |
| usf | Nintendo 64 Song |
| usflib | Nintendo 64 Song Library |
| usm | Farandole Composer Unsigned Sample |
| ust | UTAU Synth Vocal Track |
| usv | Yamaha Electone HS User Voice |
| uva | DECE Audio Data |