Unknown/corrupt illustrator file

I accidentally deleted an Illustrator file last week and used Disk Drill to recover it. The only problem is some of the files I recovered won't open for two reasons. One gives me the "file is damaged and could ot be repaired" and another gives me "the file is in an unknown formate and can't be opened" error. A few other .ai files open fine.
Does anyone have any suggestions as to what to do? Are there any programs or techniques out there that can repair or force open a file? The files show the proper file size (500k) and the right illustrator icon.
Thanks for any help or suggestions.
I'm running OSX 10.6.8 and CS6.

Hi timnancyk,
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