Quicktime 7.5 for windows won't recognize mp4 format

I am trying to play an mp4 video on my PC with Windows XP. I'm trying to use quicktime 7.5, but when I try and open the file I get the following error:
"Error -2048: Couldn't open the file MYGREATDVD.mp4 because it is not a file that Quicktime understands"
Does anybody have any idea why this is the case? I can play other formats of videos in Quicktime.

Regarding: 2048-Quicktime cannot play this file because it is not a file Quicktime understands.
FYI -I am using Quicktime PRO
I got this same message over and over when I used my free digital copy of Die Hard 4.
Solution I found: With recent Quicktime update, Quicktime seems to put a CAP on the size of the file it recognize and open.
To get the Digital Copy to work in Quicktime I compressed the File down from 5200 mbs (5.2 gigs) to 1700 mbs (1.7gbs)
Quicktime was then able to play the file and in additional I was able to import this file to itunes.
The unfortunate thing here is that the overall Quality of the file in itunes is now inferior to the quality of the file using Windows Media Player.
What I also found odd was that when I adjusted the file in itunes to play on Apple TV (convert for Apple TV) it increased the file size to 3.2 Gigs and the file plays fine. Althoug once again the quaility isnt as good as in Windows Media Player.
In my opinion this seems to be this is an issue with the Quicktime update. I tried other files out of curiosity and the same thing happened over and over. Quicktime gave me the 2048-Quicktime cannot play this file because it is not a file Quicktime understands: if the file was too large. Compressing the file allowed it to play.
*So My related question is: What is the Maximum File Size that Quicktime will recognize and play?* and *if it its not an error that will be fixed - Why would Apple put a CAP like this in place that directly results in inferior playback quality of a Movie*
Hopefully this will get resolved ...
Message was edited by: simkal

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