| File Extension: | XXI |
| File Type Description: | GameSpy Arcade Game File |
| File Type Developer: | IGN Entertainment |
| Primary Associated Software: | GameSpy Arcade |
| Primary Software Developer: | IGN Entertainment |
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IGN Entertainment created the GameSpy Arcade Game File (XXI) file for the GameSpy Arcade software series. Our data shows that XXI files are frequently utilized by PC users in United States and popular on the Windows 10 platform. Statisically, these users are most likely running the Google Chrome internet browser.
 | GameSpy Arcade by IGN Entertainment |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .TCM | IMSI/Design, LLC | CAD Files | TurboCAD Mac Drawing |
| .ERB | Open Source | Developer Files | Ruby ERB Script |
| .ISB | Sony | Game Files | Vanguard Music File |
| .U | Epic Games | Game Files | Unreal Tournament Class Package |
| .TIS | Acronis | Backup Files | True Image Script |
| .MGX | Microsoft Corporation | Game Files | Rise Of Nations Saved Game |
| .HAM | Interplay Entertainment | Game Files | Descent 2 Resource File |
| .BOT | id Software | Game Files | Quake 3 Arena Bot AI Data File |
| .CPS | Interscape | Game Files | The Powder Toy Save File |
| .ENC | Smith Micro Software | Encoded Files | Encoded Data File |
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