You could try starting a separate X session with 16 bit depth for wine alone. To do this on Debian I use the following command: xinit /usr/bin/xterm -- :1 -ac -depth 16 That should start another X session (probably accessible by CTRL+ALT+F8) with 16 bit color depth. Just go there and run your game from started xterm (if you don't have xterm on your system - just replace "/usr/bin/xterm" with path to your favorite terminal emulator (xfce4-terminal/gnome-terminal etc.). I don't know if the above command will work on Suse, but give it a try.
