.iso movie file

[pdiggitydogg]

I have a copy of Hitchhiker's Guide that is a .iso file type.

I am able to load it on a few media players that I have (including win media player, core, even win classic) - video plays just fine, but there is no audio (the file does have it though - I can see the audio visually, on player's the spectrum analyzer [or whatever you call it])

Which codec do I need for this?