Move the documentation to another location after Windows install?

[donovandigital (as df)]

I would like to move the documentation to another partition on my Windows filesystem. Someone recommended “Global Options → File Locations → SystemHelpPath”. It looked like it would do the trick but after I added the folder and moved the files, clicking on “documentation” in the start screen returns

“paclet:guide/WolframRoot” could not be found.

Windows version 8.1

Mathematica version 10.2

My “global preferences” and SystemHelpPath value, amended (see image below).

PS - what is the “x” in the last line of the SystemHepPath? I copied it directly from chat.

[lehinp (Alexey Popkov)]

I would create a Junction point.