I'm on Windows 10.
Running the command:
mklink /D "G:\test" "C:\test"
...Is successful. However, in explorer when I double click the folder on G:\ and try to access any file in there, it says "file does not exist, create it?".
The weird thing is that this has worked perfectly fine before today, and also:
It seems to work when on the same drive. If I run
mklink /D "C:\new1" "C:\test"
I have no problems accessing it in explorer.