most likely you haven't installed multimedia support on suse, isn't it? suse out-of-the-box can't play many things cuz it's illegal to do so due to some stupid patent laws (mostly US).
anyway, look for a suse multimedia how-to (google will help you find it quickly).
btw opensuse 10.0 is much faster than 9.3, and 10.1 will be much much faster again ;-) so it might be a good idea to upgrade if you have time...