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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
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