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How to open .C4G files on Linux

To open .C4G files on Linux, install/locate OpenClonk tools that provide the c4group command.

Step-by-step instructions

  1. Install/locate OpenClonk tools that provide the c4group command.
  2. Run c4group against the .c4g file to list or extract its contents (use the OpenClonk command-line documentation for supported parameters).
  3. If your desktop environment recognizes the file type via shared MIME-info, you may also be able to right-click the file and choose an associated Clonk/OpenClonk tool, if configured.

Alternative methods

  • Open .C4G in a browser-based viewer if desktop apps fail.
  • Try opening .C4G on Linux with a secondary app to rule out app-specific issues.
  • Convert .C4G only with trusted tools when direct opening is not possible.

Common issues

The file opens in the wrong app or shows as an unknown file type

.c4g is a niche game-data container; many systems won’t have an associated app by default, and Linux association depends on MIME database entries and desktop configuration.

  1. Open it with the OpenClonk/Clonk group tool (c4group / c4group.exe) instead of trying a generic editor.
  2. On Linux, ensure your system recognizes it via the shared MIME-info mechanism and set the default app association if needed.

c4group cannot read the .c4g (errors, missing contents, or extraction fails)

This can happen if the file is incomplete/corrupted or not actually a valid Clonk/OpenClonk group file despite the extension.

  1. Re-download or re-copy the file to rule out transfer corruption (especially if it came from the internet or removable media).
  2. Try listing the archive contents first with c4group; if listing fails, the container is likely damaged or not a real group file.
  3. Confirm the file’s origin is Clonk/OpenClonk-related; if not, the extension may be misleading.

I expected to “play” it, but it looks like an archive

.c4g is usually a container of game assets; it’s often meant to be loaded by the Clonk/OpenClonk engine rather than opened as a document.

  1. If you have the game, try using it from within Clonk/OpenClonk (how depends on the specific game version/content).
  2. If you are modding or inspecting content, use c4group to extract the files, then open individual extracted resources with appropriate editors.

Security note

.c4g files are compressed containers (group files). Treat them like archives: extracting them can create many files, and their contents may include scripts or game logic intended for the Clonk/OpenClonk engine.

Back to .C4G extension page