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Old 12th April 2006
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Video: 1.22 GB, 4099 Kbps, 23.976 fps, 1280*720 (16:9), XVID Mpeg-4
Audio: 137 MB, 448 Kbps, 48000 Hz, 5 channels, AC-3
Why don't you check yourself with VLC? I know 1.2 MBit/s MPEG4 ASP with AC-3 can barely be played on a 400 MHz Celeron.

the other file I've tested was only 448kb/s (1280*720, avi, ac3 audio) (based on win xp explorer's info from the avi file) and these release has more than 4mb/s
Make sure you don't mess megabits and megabytes. A megabyte contains 8.38 megabits [(2^20)*8/(10^6)].

I'm thinking maybe windows only show the audio bitrate, instead of the video bitrate.
I don't know. If you install FFDSHOW and decode your video with this filter, then the average bitrate of the portion played so far will be shown in ffdshow's property sheet. The video size is always [container size] - [audio size] - [small overhead]. If you know the audio bitrate you can aproximately calculate also the video bitrate.
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