I believe you are missing the point. The file associations are correct in the Control Panel. To fix the problem, all I have to do is go into the Control Panel as if I was going to change the...

My "fix" is faster and less trouble. My real interest is in finding out if this is a trending problem and what I might be able to do to avoid it.

Thanks anyway.

This problem has just started on several machines since 8/20/2016. On Windows 10 Pro computers, the program associated with a file type extension will not launch correctly anymore even though the...