You will have to delete your current Recorded TV library and log off and on first if you wanted to try creating it the way I did to avoid the "you already have one" issue.
I applied the REG file from my desktop as well.
When I created the library the way I did, the public Recorded TV folder was included automatically. I just manually included
the C:\Users\(user-name)\Recorded TV
folder that I also manually created to the library afterwards.
When the REG file
is merged and I logged off and on, it changed the Start Menu Record TV button to open to the location in my screenshot