There is a repair option with the command line version of zip that may allow you to repair the archive. 

zip -F Filename.zip --out fixed.zip

If that doesn't work try zip -FF Filename.zip --out fixfixed.zip

http://info-zip.org/

 

Be sure to work with a copy of the archive.

----------------------------------------------------------------------------------------

The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
bagginsbill's Free Stuff... https://web.archive.org/web/20201010171535/https://sites.google.com/site/bagginsbill/Home