When trying to open documents, getting error as File is not a valid Win32 application

Hi,
I am trying to open a MPP by clicking on the name of the file. But I am getting the error as "path\filename.mpp is not a valid Wind32 application".
I am able to save the document and open it in MPP, but clicking on the document name is giving this error "File is not a valid Win32 application".
I have tried to repair "Microsoft Project". But still the same issue. I am using Office 2010. SharePoint site is SP 2010.
How to fix this?
Thanks

Hi Ed,
I am sorry, but I could not understand that answer.
I have put that answer in the below quotes:
"You are never going to believe what I did. This is a nice ending to a very confusing situation. lol
I uninstalled Project 2007 and rebooted my laptop and reinstalled Project 2007. No Difference at all. Same thing happened. I just couldn't stop thinking about how 2007 Microsoft Office Component kept showing up in default programs. This has bugged me for days.
I went browsing in my program files. I typed in Microsoft Office Project. The only thing I found was WINPROJ. I decided to check it out. I checked it's properties, size, location, etc.. What did I have to lose at this point? I clicked on it and it went into
my default programs as Microsoft Office Project 2007. This doesn't make any sense to me. But, don't try to fix anything else if it isn't broken, right? It's working and I am so relieved. I mean, YAAAAY!!! Another mystery solved...
Thanks for hanging in there with me to help solve this mystery. You have been of great assistance to me. You made me think outside the box and it worked.
Laura"
Does it mean MPP Should be a 2007 version?
Thanks

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