Corrupted excel 2007 file assist

Hello, I recently reinstalled win 7 and forgot to back up a few files from my old desktop beforehand, I have used a data recovery tool to get the files but when I try to access them it says they are corrupt, I have tried the few things I can think of like changing the file extensions to various things, open excel in safe mode, excel open and repair.

Anyone have any suggestions or know of any programs to fix this? Could really do with getting into this file.

Cheers.