My problem was that I had file extensions hidden. I'm using a Windows 8 Operating System so to change that I had to:
Left Click File Explorer> Left Click "View" Tab> Check the box "File name extensions".
This makes it so I could view the extension at the end of the file name.
This allowed me to delete the (.5) to "certificate4.5", to add (.psd) "certificate4.psd"
It opened in CS6 perfectly and is editable.
Before when I had changed the end of the file name I couldn't delete the (.5) so it would do this: "certificate.5.psd" Making it a file that isn't recognized by anything (.5.psd).