Hi Nick, thanks for responding. Sorry I wasn't clear.
What I want to figure out is regarding FCP X and FCP Studio in the same machine.
I installed FCP X. Moved the FCP X's applications into a folder. I moved the FCP Studio Apps out to the root directory of my applications folder.
But what I didn't do, is open Motion 4, before opening any other application form FCP Studio. (This is what Apple recommends to do)
Now every time I want to open a motion 4 file directly from FCP 7, the new motion 5 opens. I'd have to modify files individually to "open with" motion 4.
I am working in a school setting, (public computer) so I want to leave it easy for users...
I looked a FCPX once and forgot all about it.
Download this free tool: http://www.digitalrebellion.com/prefman/
Trash the preference files for FCS and FCPX, Motion 5 etc and start over as per the Apple recommended instructions.