Quicktime X Won't Load movies with AC3 track

Not sure if anyone else has seen this, it is more than likely that this is the case but maybe some people don't realise it.
Any movie file I have that has an ac3 track on it will not open in quicktime player x for me, but will work in quicktime player 7. When I use quicktime player 7 to completely remove the ac3 track (not just disabling it, that doesn't work), it will open fine in QT X. If I open a file that I ripped from DVD 6 months ago, quicktime x will open it fine as there is no AC3. A file I ripped yesterday won't open as it has AC3.
I tried to call the apple helpline but they were next to useless, considering the chap thought I wanted to put a password on quicktime when I talked about passthrough, and then directed me to download quicktime 7, like I hadn't used it to diagnose the issue!
Has anyone else encountered this issue, and more importantly does anyone know how to fix it, apart from using quicktime 7?

Another questions occurs to me: May I use Quicktime 7 for playing MPEG-2 videos with audio AC3 files? Or do I need Quicktime 7 Pro? And where do I get these applications -- if they will solve the problem? Do I have these applications on my Snow Leopard DVD? I checked my utilities folder and they are not in there. Will QT 7 and QT 7 Pro even work with Snow Leopard? I'm new to Mac and very confused, obviously.

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chaquemain wrote:
Since Os X Lion, when trying to load a movie (DivX) in QuickTime 10 at the same time that the related subtitles file (.srt) is in the same folder as the movie, QT 10 suggests to use QT 7. QT 10 cannot load the movie with subtitles (in Snow Leopard everything was OK). Q& 7 is useless too because it cannot export movies to another format.
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CLICKY CLICK---> https://discussions.apple.com/docs/DOC-3602
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Quicktime X Won't Load movies with AC3 track

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