I have never had a problem with unzipping the mod pack.
I currently use powerarchiver v6.11
http://www.powerarchiver.com/
Maybe you should try it.
P.S.
It has the added bonus of multi disk spanning and supports all the popular compressions such as rar , zip etc...
__________________
RRRRRRRRRRAAAAAGGGGGGGGGHHHHH
old avatar =
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Hey GUTB where did you go...???
He is still driving his mighty armada at 3 miles per month along the interstellar highway bypass and will be arriving shortly