No sounds at avi movies

Hi, I can't hear anything, no sound at avi movies, they have Direct Show Decoder, and audio format Dolby AC3 Audio (8192). I tried with quicktime, real player, flip-player, divx and always is the same. I couldn't find any codec or player to solve the problem. I have OS 10.8.2. Is there a solution? I can see and hear them perfectly in Windows.