WinZip® automatically handles many errors in Zip files. However, some invalid Zip files may contain more serious errors that WinZip was not designed to repair.
Note: most errors in downloaded Zip files can be corrected by simply downloading the Zip file again.
If you have a damaged Zip file and can't obtain a new, undamaged copy, see the web page at http://www.winzip.com/zipfix.htm for a possible solution.