@Bryce Tnx.

It works now. I thought I tried the Bracets yesterday before my post but probably I mistyped something.

To answer the other questions.

No it's not a part of the login script. It's a mass change that needs to be automated.

Yes the users are local admin on their machine.
Yes fellow IT'ers, I know and please don't start any conversation on this. I don't agree with it eighter :-)
Lecacy!

No I don't want to push the change towards the machines.
The users are local admin anyway so why bother.