Set Group Policy Scripts (Shutdown) programatically

I'm looking for a way to set the local machine group policy shutdown script programatically.

I've tried modifying all of the following registry keys, but they seem to take no effect on what's displayed via gpedit.msc.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Group Policy\Scripts\Shutdown\0\0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Group Policy\State\Machine\Scripts\Shutdown\0\0
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Group Policy\Scripts\Shutdown\0\0
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Group Policy\State\Machine\Scripts\Shutdown\0\0

I do notice that if I change the script via gpedit.msc, the above registry keys get updated to the new value.

I've tried changing these registry keys, and than rebooting the computer, but after rebooting I still see the old value in gpedit.msc.

Moreover, when I shutdown the machine, it seems to be calling the old script instead of new script associated with the registry key changes.

Does anyone know how to change this policy through VB or C++?
gpedit.png