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Full user review
"Repaired Invalid File That WinZip Could Not Open"
I got a zip file from a photographer that WinZip and Windows built-in unzip program said was "not a valid archive." I used the Repair function of WinRAR (Tools menu --> Repair Archive), and it was fixed!
Ummm, not free. Too bad there is not a single-file repair fee option.
If you need more than a basic unzip, this program is certainly one to consider.