How can I open (or repair) corrupted ZIP files on Windows?
Is there a way to force 7-Zip to open them?
How can I open (or repair) corrupted ZIP files on Windows?
Is there a way to force 7-Zip to open them?
Zip Repair from Disk internals looks like a good application to do what you are after. This seems to be the only free fully-featured application that I could find to do what you are after.

That said, depending on how corrupt the file is, you may not have that much success with getting all of the files out in their proper condition. You will probably not be able to get all your files out (if at all).
Best Unzip Program to open Broken and Corrupted Zip files -- Yes, 7-zip!
If 7-zip cannot get all the files, I'd try with joshhunt's Zip Repair reference.
Please do tell if you get more data extracted from a broken archive compared to that extractable by 7-zip.
Depending on the nature and extent of the damage, WinRAR has done an excellent job in recovering files from damaged archives. I can usually recover 90%+ of the files.
It bears pointing out that the regular ZIP command in the Info-ZIP distribution has an -F option to attempt to repair broken archives.
http://computers.tutsplus.com/tutorials/how-to-repair-damaged-zip-files-with-terminal--mac-49294 shows how to use it on a Mac, but Unix will be identical, and Windows fairly similar (if you have the WinZip command-line version; look for wzzip.exe).