Playing sound over PWM (WinCE)

Where should I add "Reg0x0e"=dword:0x03000000 to?
On the page you linked, I found the path HKEY_LOCAL_MACHINE\Drivers\Builtin\Audio for headphone volume, but I see no registry path for the Reg0x0e.
Should that even be added to the registers?

Kind regards,
MGlolenstine