Setting a registry key in AutoCAD LT via a toolbar button

Is it possible to set a registry key from within AutoCad LT

I want to change a registry key from within AutoCad 2006 LT. operating system is Windows XP

more specific:
I want to change the value that holds the *_toolpalettepath variable.

i want to do that just by clicking a button on a toolbar.

In full autocad it works with this line of code:
^C^C*_toolpalettepath "c:/path/to/toolpalettefolder"
but not in LT because you cannot see this variable.

i have a 3rd party software installed that runs lisp within acad LT (and vba - i think)
it's LT-extender

can someone provide me with the correct lisp code to accomplish that?

thanks, johan