XVid and AC3 file (no sound)

I have done a search for an answer to this but nothing has really been useful so I figured I would try again.
I have a large video that is in XVID format with AC3 sound. It plays the video fine but has no audio. When I first started up the video it told me that Quicktime was missing required software. I didnt follow the link and it hasnt given it to me again. Is there a way to play the audio and the video?
Any help would be greatly appreciated.
Jamey

It plays the video fine but has no audio.
The QT structure does not support AC3 audio "natively" nor does it support a "pass through" option like the Apple DVD Player.
Is there a way to play the audio and the video?
You can add the A52 QT component, but this only supports stereo playback via core audio.

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XVid and AC3 file (no sound)

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