I had the same problem not too long ago. ok first step is to install the 1st 3 of the 4 componets on http://ld-anime.faireal.net/guide/ogm-en the 4th has an out of date link. The next will be to install VLC media player from http://www.videolan.org that little player is really starting to grow on me. All that allowed me to play the files with the only problem being I can’t switch what audio track is playing or subtitals because that 4th link is out of date. All my attempts to find an update have failed :-( so if you can find a working one past it so I can get it. If I’ve wanted a non default audio stream I’ve been using a modified version of virtual dub found at http://virtualdubmod.sourceforge.net/ a program found at http://www.chip.de/downloads/c_downloads_8832403.html to convert the ogg audio files virtualdubmod makes to wav files. don’t be spooked by the fact the site is in a foren langwich (dutch or german I think) the program is in english as is the download link. then I just use regular virtual dub to reattach and compress the audio to the vidio stream. On a side not if anybody know of an app that allows you to take an ogm and change around audio and subtital streams (add, remove, and change default) pleas let me know.