I don't what the "Internal System drive" is. I upgraded to Finale in 2018, so I "think" the file I was trying to open was created with Finale 25. But since none of my Finale files are opening, this...
Yes, the problem is isolated to just my Finale documents. And I find it strange that on Monday everything was working fine - then all of a sudden, not.I have not tried putting the files on a usb......