https://bugs.winehq.org/show_bug.cgi?id=49256
--- Comment #3 from Alan A. grsfdhj@tiscali.it --- Somebody mentioned in bug 48171 that the game executable might be checking if it is run on wine or not because various wine-related function names can be found in the exe.
I just tried changing them so they don't match real wine function names, but the error stays the same.