I'm trying to play a movie on my Mac, but I was prompted that I need a separate audio decompression codec. I downloaded MediaInfo which told me that the audio type is AC-3 so I downloaded several codecs for that format, but none are working. Is there something I need to do to get Quicktime or DivX to recognize them, or should they just go out and "find" them in my system when I open the program? Any tips at all about getting this type of file to play would be very helpful 
Other users who have downloaded the same file are having trouble playing the sound as well. Not all of them are Mac users. I'm interested in getting a legitimate answer, not getting into silly a Mac vs Pc battle.

Other users who have downloaded the same file are having trouble playing the sound as well. Not all of them are Mac users. I'm interested in getting a legitimate answer, not getting into silly a Mac vs Pc battle.