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Restore of Excel file lost password

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Has anyone come across the issue where you restored a locked excel file (using 2009 true image version) and after restoration your password will not open the excel file? It seems to have corrupted the password. Any ideas on recovering or setttings I can change to fix this?

thanks

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The first thing is to make sure that the Windows security settings (access rights) are allowing you have full access to the file. This is the kind of settings that might change during a file backup/restore. Right click on the file, choose properties, security. Verify your username has full access.

If you are talking about a password set within the Excel application, I seriously doubt ATI would have corrupted the file. You can still try to crack the password. You can find password cracking tools on the Internet. Be careful when you download them (backup your system before in case you get some malware).
If you are using a more recent version of excel 2007 and later, your file is probably AES encrypted. You can try the password cracking tool but the chances are slim if the password is not weak.
If you are using an older version of excel, your file is probably encrypted with RC4 and that will be easier to crack.

If you have protected the file some other way (EFS=encrypted file system), it is possible that certificates don't match. In this case, you would be out of luck.