I've been in touch with the Gameforge forum staff and the forum staff as well as the company in general is entirely aware of both the x64 client and...
Just rightclick that big red GM icon in the game and you see the attack flag option. To change the default, click the icon normally to start the tool...
I highly advise against using these files at this point. 6.4.2 uses the old, outdated 32bit client while there is a complete 64bit client running on...