AC3 Codec is a QuickTime component which allows the playback of AC3 audio inAVI files. The component uses the liba52 library for the AC3decompressing.

First you need DivX 5.1 which correctly load the AVI file into QuickTime. Once you have DivX 5.1 installed, if you are on MacOS X, drop "AC3 Codec.component" into /Library/QuickTime, or if you are on MacOS 8.x/9.x, drop "AC3 Codec" into your Extensions folder and restart.

That's it ! Now all you need to do is open an AVI file that has AC3 audio, and play!

ENJOY !