6 gig ethereal file

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For some reason one of our tech's was capture at a site for a month and
did not break the files up. I can't get ethereal to open the file as the
thing is just to big. All I need is the last day of the capture, I have
tried tethereal, but it does not seem to be filtering out what I want.
Here is what I tried. 

tethereal -r c:\etherXXXXSXB8AT -w c:\outfile -R frame.time >= "July 27,
2006"

So since the last day of the capture was the 27th I though this would
work. When I look at the outfile size it's the same size as the
original. Any thoughts? 

This is on a winxp. 
 
Jon Shier