Basically you can't zip a zip file and get any meaningful reduction in size.
That said, programs like PKZip (now called SecureZip) usually allow you to
change the compression settings, offering a balance between file size and
time to unzip. The smaller the zipped file size (more compression), the
longer it takes to unzip. The reverse also holds true. The larger the zip
file (less compression), the faster it is to unzip. Make sure that you are
using the method that minimizes file size. In SecureZip version 11, the
setting is on the Compression page of the Options dialog, accessible from
the Tools menu.


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting
www.cpearson.com
(email on the web site)


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