Those are just Codecs messed up. Try searching (google) the net for some of those. Youll be ok. Just install them.
Thx

Edit: Free-Codecs.com :: Download latest audio codecs, video codecs, codec packs and tools, FREE!
Try downloading some from this site. FFDShow will do.

P.S. I don't know whats this have to do with LW but... Whatever It could be usefull for all those who likes to preview stuff.