| twv | VCM-ROM Linker Voice Data |
| txt | Steinberg LM-4 Audio Bank Data |
| txw | Yamaha TX16W Audio |
| u | AU Audio |
| ub | Unsigned Byte Audio |
| uds | Bitheadz Unity DS-1 Data |
| 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 |
| uvd | Yamaha Tyros Drum Voice Data |
| uvn | Yamaha Tyros Audio |
| uvo | Sanyo Katana DLX Recorded Voice |
| uw | Unsigned Word RAW Audio Data |
| uwf | UltraTracker Wave File |
| v2m | V2 Synthesizer Audio |
| v8 | Covox 8-bit Audio Data |
| vab | Sony PlayStation Sound Bank |
| vag | Sony Playstation Compressed Audio |
| val | Olympus Voice Reorder Audio |
