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Winzip is probably messing up with you. You need 7zip or Winrar. There should be only 10-12 files inside unpacked folder, if you see hundreds - your WinZip is demolishing game archieve into many small pieces, which makes it unplayable. 

It happens because we dont really use much of encryption, so some tools are trying to see game file as another archieve and shredding it as result.