So I finally had to get a new PC and move to Windows 7. So I lost my MathCad 11 installed on XP. I popped in the disk and after installing I'm told that PTC was "nice" enough to not let you activate the old license anymore. However, when I download the new Prime it doesn't recognize my old MathCad 11 files. I never upgraded because it had all the functionality I needed, but now it seems my files might as well be written in Sanskrit.
Is there any way to continue using these files? Or am I stuck with now figuring out how to rewrite them in Excel? (because I'm not about to trust PTC to not do the same thing again in the future and leave me high and dry)