| xmf | Extensible Music Format File |
| xmf0 | Extensible Music Format File |
| xmf1 | Extensible Music Format File |
| xmi | Extended MIDI Song |
| xms | XMS Tracker Module |
| xmz | ZynAddSubFX Master File |
| xmz | FastTracker 2 Extended Module |
| xp | FastTracker 2 Pattern |
| xrni | Renoise Instruments Data |
| xrns | Renoise Song |
| xsb | XACT Sound Bank |
| xsml | iRomplerMap Audio Data |
| xspf | XML Shareable Playlist File |
| xt | Fast Tracker 2 Music Track |
| xvag | Sony PlayStation 3 Audio File |
| xwb | XACT Wave Bank |
| xwm | Microsoft xWMA Compressed Audio |
| xwma | Microsoft xWMA Compressed Audio |
| xwv | Valve Xbox360 Audio Data |
| yadpcm | Yamaha 4-bit ADPCM Format RAW Data |
| ym | Atari ST Audio Data |
| ytif | Yellow Tools Independence Image |
| ytil | Yellow Tools Independence Instrument Library |
| z00 | Casio WK-3000 Rythm Data |
| zab | Zipped Audio Book |
| zaf | Zoom Recorded Audio |
| zax | Zaxcom Audio Data |
| zdv | Zyxel Voice Mail Audio Data |
| zgr | Zero-X BeatCreator Loop |
| zvd | Zyxel Modem Voice Data |
| zvr | SAFA Voice Recorder Data |
| zxs | ZX Music Player Sound |
| zyx | Zyxel Voice Mail Audio Data |