What is the C4U file format?
A file with the .C4U extension is a file known as OpenClonk Update System. It belongs to the Game Files category. This format is associated with Open Clonk Development team.
The reliable way to open a .C4U file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .C4U files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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