WinZip – Unexpected end of file error.

One of our sales reps has a program that I archived and saved on our server using winzip. When I went to restore the archive, it gave me an unexpected end of file error. The problem I have is that the drive has since been formatted and he has 3 years of bids in that archive. My question is – Does anybody know if I can restore/repair this file? Even if I can just get some of the information back, it would help out tremendously.