Taken from the Apple site..
http://www.apple.com/quicktime/guide/hd/The advanced H.264 codec makes it possible for QuickTime 7 to play back high-definition video on a personal computer without additional hardware required. However, you’ll still need a G5 or equivalent Windows system to display so much media.
If you have a G5 system and the .256 codec then you'll be able to view HD quality, if you dont have those, you are (in effect) just viewing a regular high-quality movie.
Regards,
Lee





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