Why can't Quicktime playback Muxed MPEG-2?

When I get quicktime to playback a muxed MPEG-2 file there is no sound. Why does this happen? The description on version tracker says:
The QuickTime 6 MPEG-2 Playback Component provides QuickTime 6 users with the ability to import and play back MPEG-2 content, including both muxed (the audio and video tracks have are interlaced together into one track) and non-muxed (a.k.a. elementary) program streams.
However, for me this isn't happening. I can see the video but get no audio. Yes - I know other tools can play the sound, but why not Quicktime?

http://www.apple.com/quicktime/mpeg2/faq.html
You'll notice the restrictions on some audio codecs. Not all DVD's are the same.

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