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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .X13 | DarXabre | Game Files | Hooligans Game Archive File | Dragon UnPACKer | Open Source |
| .XA2 | Csabo | Game Files | XWE Data File | XWE | Open Source |
| .XAC | Tilted Mill Entertainment | Game Files | SimCity Societies Game File | SimCity Societies | Tilted Mill Entertainment |
| .XAN | Team17 | Game Files | Worms Map File | Team17 Worms Mayhem | Team17 |
| .XCR | Strategic Studies Group | Game Files | Warlords Battlecry Game File | Warlords Battlecry | Strategic Studies Group |
| .XDP | Adobe Systems Incorporated | Game Files | XML Data Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XDS | Nintendo | Game Files | DS Game Maker Project File | Invisionsoft DS Game Maker | Nintendo |
| .XEN | Activision | Game Files | Guitar Hero 3 Data File | Guitar Hero 3 | Neversoft |
| .XEX | Microsoft Corporation | Game Files | Xbox 360 Executable File | Microsoft XBOX | Microsoft Corporation |
| .XMB | Microsoft Corporation | Game Files | Age Of Empires Game Data File | Microsoft Age of Empires | Ensemble Studios |
| .XNB | Microsoft Corporation | Game Files | XNA Game Studio Binary Package | Microsoft XNA Game Studio | Microsoft Corporation |
| .XOF | Themekit Systems Ltd | Game Files | Reality Lab 3D Image File | MindRender Virtual Reality Explorer Kit | Themekit Systems Ltd |
| .XOM | Team17 | Game Files | Worms 3D Object File | Team17 Worms Mayhem | Team17 |
| .XP | Starbreeze Studios | Game Files | Fastracker 2 Pattern | Fasttracker | Starbreeze Studios |
| .XP3 | Open Source | Game Files | KiriKiri Package File | XP3 / Kirikiri tools | Open Source |
| .XPC | Codejunkies | Game Files | DSI Action Replay Saved Code | DSi Action Replay | Codejunkies |
| .XPD | Sony | Game Files | PlayStation Store PSP License File | PlayStation | Sony |
| .XPK | THQ Nordic | Game Files | WWE RAW Model File | Cygnus Hex Editor | SoftCircuits |
| .XPX | Intercon Associates | Game Files | Intercon FormNet File | Accessible FormNet | Intercon Associates |
| .XRD | D. G. Jones and A. K. Dewdney | Game Files | Core Wars Data | Core War | D. G. Jones and A. K. Dewdney |
| .XS | Microsoft Corporation | Game Files | Age Of Empires 3 Map AI Generator | Microsoft Age of Empires | Ensemble Studios |
| .XTBL | Unknown Developer | Game Files | XTBL Ransomware Encrypted File | AVG Antivirus | AVG Technologies |
| .XXI | IGN Entertainment | Game Files | GameSpy Arcade Game File | GameSpy Arcade | IGN Entertainment |
| .XXW | Pandemic Studios | Game Files | Zero Engine Terrain Data | Star War: The Clone Wars | LucasArts Entertainment Company, LLC |
| .XXX | BloodDolly | Game Files | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
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