Problems caused by the update to Windows 10

[LM7]

In my experience, Windows updates - with almost all versions of Windows - almost invariably cause Office files to be displayed externally, even though they were previously displayed internally in UR; this problem can be readily solved by double-clicking the .REG file linked to in Kinook's reply. So it's a good thing to save this .REG file for future reuse - that's what I do.