like you said EART, i have never seen a VBR file which shows 0 bitrate. they normally show bitrates which do not exist and when you play them using winamp or someother program, you will notice that while playing winamp will show you that the bitrate keeps on changing (128 to 256 to 192 then back).
just try and do the things which i told you whenever you have time and let us know of the result
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