Don't put your screen in landscape mode under settings because it will freeze. Go into betaplayer and go under "options">"orientation" then to right handed or left handed view, etc.... Next for addittional files to be played go here
http://forge.topcat.hu/frs/?group_id=5 and download this betaplayer.setup.UNSTABLE.0805.exe and this asf.setup.UNSTABLE.0728.exe
This addittion lets you play OGG,OGM,MKV,MKA,MP1,MP2,MP3,MPA,AVI,DIVX,WAV,RMP,A SF,WM,WMA,WMV,ASX,WMX,WVX,WAX, you get the idea.
Give it a try
Jason