Did you look into AppDB, there are lot of different versions, for instance http://appdb.winehq.org/objectManager.php?sClass=version&iId=8369 They recommend to install mfc42.dll with "winetricks vcrun6", but without further information from you this is just a guess. You may try to play around with "LANG=... wine [Gameclient]" to get a better error message regarding the missing dll, see some posting on that page.
