| File Extension: | C4U |
| File Type Description: | OpenClonk Update System File |
| File Type Developer: | Open Source |
| Primary Associated Software: | OpenClonk |
| Primary Software Developer: | Open Source |
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OpenClonk Update System File files are the most popular type of files to carry the C4U file extension, originally developed by Open Source for OpenClonk. User statistics infer that these C4U files are popular with users from China and most frequently found on the Windows 10 platform. A high percentage of these users browse the web using Google Chrome.
 | OpenClonk by Open Source |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .J | Oracle Corporation | Developer Files | Java Source File |
| .GBA | Unknown Developer | Game Files | Game Boy Advance ROM |
| .KMAP | Open Source | Uncommon Files | LyX Keymap |
| .DPG | Open Source | Video Files | Nintendo DS Movie File |
| .22 | Open Source | Data Files | Linux File |
| .SUJ | Open Source | Data Files | Stacker Unlimited Job |
| .KHS | Open Source | Uncommon Files | Kwalitan History Data File |
| .VPM | Garmin | Audio Files | Garmin Voice File |
| .LTX | GSC Game World | Game Files | S.T.A.L.K.E.R. Properties File |
| .BKF | Microsoft Corporation | Backup Files | Windows Backup Utility File |
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