Zipping or Unzipping a file…
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Do you have trouble zipping OR unzipping a file....
Here are two choices both companies offer a MAC and PC version
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WinZip: http://www.winzip.com/downwz.htm they offer free and fee versions
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Most MACs used to come with Stuffit which now is $29.99
http://www.stuffit.com/v2/mac-s.html AND is worth the investment if you don't have it...