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From: Richard Stallman <rms@gnu.org>
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Subject: Re: zip-mode mis-displays large files
Date: Sat, 22 Apr 2006 08:03:00 -0400
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The problem is integer overflow.  Emacs would be unable to visit that
subfile either, since it can't make a buffer that big.

If you edit a file that comes before the big file in the archive, does
it mess up the archive?  I can imagine that it might.