Sorry, I'm not sure how users can report bugs in your issue tracker, so I'm posting it here. Some time ago I bought Clarc game which uses Unity 3D on GOG. However on my system (current Debian testing x86_64) it fails to run producing such error: I straced it (see details described here: https://www.gog.com/forum/clarc/there_is_no_data_folder_error_on_linux ) and there is definitely something weird going on. Others reported similar issues with other Unity 3D games (such as Shadowrun returns). What was common in those cases is the partition where the game was run from. It was a large (1+ TB) partition with XFS filesystem. In my case it's 1.9 TB, others reported a similar problem on 2.6 TB with XFS. I reported this bug to the developers of Clarc but got no response from them at all. Can you please look into it, since it appears to be a Unity 3D bug? Thanks!