How do you change the default version of Quartus that opens files?

I did try that, and the root directory was already pointed in the correct place. However, I got it to work by temporarily removing the quartus.exe for version 13.0sp1 from it's respective file folder, then launching a QPF and picking the correct association to 17.1 at the windows prompt. Why this wouldn't work through the windows default programs manager is beyond me, but it works now.