Code: [HKEY_CLASSES_ROOT\DesktopBackground\Shell\Sounds panel\command] @="control /name Microsoft.Sound" You have missed it.
Well,for those who don't know this reg.fix it looks like this;context menu(right click): The four icons in the bottom. If you like to have it,it's is here; Extract the reg.fix and click it to add to context menu: Thanks to Tito.