I have used a neat DLL by Alex Robbio called "MS Word Compare" succesfully on a 32bit WIn 7 machine, but I am unable to get it to work on a 64bit Win 10 machine. The DLL enables a user to compare two different MS Word documents - you highlight them in Windows Explorer, right click, and select the "Compare" line on the WE context menu and the DLL launches MS Word showing the differences between the two documents. See here
The problem is that on the 64bit machine that "Compare" line does not appear in the context menu.
I have registered the DLL, and when running Nir Soft's "ShellExView" it shows up as an enabled 32 bit shell extension.