Zip Repair is a software that will repair corrupt Zip files. Usually a corrupt Zip file gives the error message:
"Cannot open file: it does not appear to be a valid archive"
Zip Repair creates an error free backup of your original file for instant access. No special skills required. A simple user interface with full install / uninstall support.
* Zip Repair will fix CRC errors in .zip files so that data can still be uncompressed
* Zip Repair supports spanned zip volumes. You can now repair and extract from a spanned zip set even if part of the set is missing.
* Full support for the Zip64 format
* Support for huge file sizes 2GB+ (as long as you have the disk space)
The trial version of Zip Repair Pro will recover files of 5mb or less for free.

The license of this software is Free Trial Software, the price is $29.95, you can free download and get a free trial.