question about ps2 media player

i wanted to kno if there was a media player for ps2 that supports rmvb files? theyre small and easily fit on my usb hd. i have dragonball/z/gt plus all movies, so converting to .avi nearly triples the amount of required space, and takes forever to convert. ive only got an 80 gig hd. so either a player that supports rmvb, or a small file type that sms supports wouldl be great to know. otherwise i need a FULL guide on playing the rmvb files over network. my comps hdd doesnt have enough space to convert all to avi either.