You can repair your corrupt ZIP file manually. It is not a big process, it involves very easy steps. The steps are:
Open WinZIP application
1. Click on file, and then select open
2. A find archive window will be opened, select corrupt rar file from your system
3. Click on open button
4. Press Alt+R
5. Repairing File Name.rar will be opened
6. Click on browse to save repaired file at desired location
7. Check Treat the corrupt archive as ZIP box, and then click OK
8. After corrupt RAR archive is repaired, click on close.
If your file is highly corrupted and you need to use software then you can use additional software. You can use recovery toolbox for ZIP.
You can find it here http://goo.gl/pYF63J
also there’s some information about such threads.