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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .WPP | Serif | Audio Files | WebPlus Project File | Serif WebPlus | Serif |
| .WRK | Cakewalk, Inc. | Audio Files | Cakewalk Music Project | Cakewalk SONAR | Cakewalk, Inc. |
| .WSQ | UTAU Team | Audio Files | UTAU File | UTAU | Vocal Synthesizer |
| .WUS | WUSSOFT | Audio Files | WUTG Tagged Audio File | WUSSoft AutoSound | WUSSOFT |
| .WUT | WUSSOFT | Audio Files | WUTG Tag File | WUTG Editor | WUSSOFT |
| .WV | David Bryant | Audio Files | WavPack Audio File | Nullsoft Winamp | Nullsoft |
| .WVC | Open Source | Audio Files | WavPack Correction File | WavPack | Open Source |
| .WVE | Wondershare Software Co., Ltd. | Audio Files | Wondershare Filmora Project File | Wondershare Filmora | Wondershare Software Co., Ltd. |
| .X3V | Yamaha Corporation | Audio Files | Yamaha Motif Audio | Translator Professional | Chicken Systems |
| .XA | Electronic Arts | Audio Files | The Sims Audio File | Electronic Arts SimCity 4 | Electronic Arts |
| .XAD | Riven the Mage | Audio Files | eXotic ADlib Sound Format File | Unknown Software | Unknown Developer |
| .XFS | Elabtronics Company | Audio Files | eRacer Sound File | CoreChart | Elabtronics Company |
| .XI | Starbreeze Studios | Audio Files | Fasttracker 2 Extended Instrument File | Awave Studio | FMJ-Software |
| .XKR | Sing-Magic | Audio Files | Sing Magic Karaoke Song | Sing-Magic Karaoke | Sing-Magic |
| .XM | Starbreeze Studios | Audio Files | FastTracker 2 Extended Module | ModPlug Player | Open Source |
| .XMF | Open Source | Audio Files | Cal3D XML Mesh File | Cal3DViewer | Open Source |
| .XMI | Object Management Group (OMG) | Audio Files | XML Metadata Interchange File | Eclipse IDE for Java Developers | The Eclipse Foundation |
| .XMS | Alexander Gross | Audio Files | Music Studio Project | Alexander Gross Music Studio | Alexander Gross |
| .XMZ | Starbreeze Studios | Audio Files | FastTracker 2 Extended Module | ModPlug Player | Open Source |
| .XP | Starbreeze Studios | Audio Files | Fastracker 2 Pattern | Fasttracker | Starbreeze Studios |
| .XPA | SoniqCast, LLC | Audio Files | SoniqSync Extended Playlist | SoniqSync | SoniqCast, LLC |
| .XPF | Open Source | Audio Files | Linux MultiMedia Studio Preset File | LMMS | Open Source |
| .XPL | Interscape | Audio Files | LcdStudio Playlist File | LCDStudio | Interscape |
| .XRNS | Renoise.com | Audio Files | Renoise Song File | Renoise | Renoise.com |
| .XSB | Microsoft Corporation | Audio Files | XACT Sound Bank | Microsoft XACT | Microsoft Corporation |
| .XSP | Open Source | Audio Files | Kodi Smart Playlist File | Kodi | Open Source |
| .XSPF | VideoLAN | Audio Files | XSPF Playlist File | VLC Media Player | VideoLAN |
| .XT | Derick Rethans | Audio Files | Xdebug Trace File | Xdebug | Derick Rethans |
| .XWB | Microsoft Corporation | Audio Files | XACT Wave Bank | Microsoft XACT | Microsoft Corporation |
| .XWC | Starbreeze Studios | Audio Files | Starbreeze Sound Data | Knights of the Temple | Starbreeze Studios |
| .XWV | Valve | Audio Files | Valve Xbox360 Audio Data | Valve Source SDK | Valve |
| .YGD | Open Source | Audio Files | YouGooDai Playlist File | YouGooDai | Open Source |
| .YM | Atari Corporation | Audio Files | Atari ST Audio File | Nullsoft Winamp | Nullsoft |
| .YNX | Unknown Developer | Audio Files | Segmax Seqprest Compressed File | Unknown Software | Unknown Developer |
| .Z00 | Casio Computer Co., Ltd. | Audio Files | Casio WK-3000 Rythm Data | Casio Data Manager | Casio Computer Co., Ltd. |
| .ZAB | VideoLAN | Audio Files | Zipped Audio Book | VLC Media Player | VideoLAN |
| .ZAF | Zoom Corporation | Audio Files | Zoom Audio Data | Zoom Player | Inmatrix Media Solutions |
| .ZAX | Zaxcom | Audio Files | Zaxcom Audio Data | Unknown Software | Unknown Developer |
| .ZEL | Andrew Maclean | Audio Files | Zel MIDI Source File | Zel | Andrew Maclean |
| .ZPA | zplane.development GmbH & Co. KG | Audio Files | Vielklang Audio Metadata File | Steinberg Cubase | Steinberg |
| .ZPL | Inmatrix Media Solutions | Audio Files | Zoom Player Play List | Zoom Player | Inmatrix Media Solutions |
| .ZVD | Zyxel Communications | Audio Files | ZyXEL Voice File | Zyxel Z-Fax modem Software | Zyxel Communications |
| .ZVR | SAFA Inc. | Audio Files | SAFA Media Audio File | Microsoft Windows Media Player | Microsoft Corporation |
| .ZYX | Zyxel Communications | Audio Files | ZyXEL Voice File | Zyxel Z-Fax modem Software | Zyxel Communications |
| ._1 | Interscape | Audio Files | Tuningwrench Audio Utility Compressed Audio | Tuningwrench | Interscape |
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