Yeah, their audio previews are definitely funky. Its a shame they didn't just use mp3s. I tried to play a couple of the previews (on my mac) using mplayer and it didn't like either one. VLC played one, but not the other. The one that it did play took forever to start playing and then skipped a lot which may be related to their site in general seeming really slow. Anyway, you might try VLC.

-Mike