you need ogg vorbis video codec there very hard to find
and one other one

i can tell you more as soon as im on my computer i have the codecs

ill get back to you on where to find the codecs

but whats cool about ogm files if the anime is in english you can switch it to japanese and back and forth or add subtitles those are some of the options

but when you do get the ogg vorbis codec when you try to open it hold the shift key and right click tell it to open with windows media player always for these types of files and that should work