Thanks, David!
So, just a bit more on that, do you use a VMWare virtual installation of Windows on another drive? With one version on that drive?
I hadn't thought of that, but now it makes sense. I like to use CA 10.8 because I'm much faster in it; it's a much more simple program. Then I want to be able to make a copy of the file and open it in Premier. Once it opens in Premier I know I can never open it in version 10.8 again, but that's okay.
The way I have it at the moment, once I installed both programs in Windows 10 the Premier version took over, and all .plan associations automatically become Premier, precluding my ability to work my way.
Steve