Project won't open

I have three projects in a folder on our EPPM database. I can open the first two, CI0a and CI0b, but CI0c (a copy of CI0b) won't open. You can see in the screenshot where the line has turned blue when I clicked on it and tried to open it. After about ten minutes, I get the message at the top of the screen that says the program is not responding.

Is there a way to retrieve an earlier version from the EPPM database.

Thanks,

Rob