Sorry it took me so long to reply. I'm new to this forum and thought I would be notified when some one replied.
I'm not sure. Either XPSP3 is not used or it doesn't work as expected.

I have an old XP program, xReminder Pro, that I have been using for many years. I am currently running it in Compatibility Mode on Windows 7 and it runs fine. On my Windows 10 test machine, this...