CDBurnerXP expects the ContextMenuHandlers key to exist, and apparently
enumerates it until it receives ERROR_NO_MORE_ITEMS. If it fails to open the
key, it will spin forever trying to call RegEnumKeyExW(NULL) and getting
ERROR_INVALID_HANDLE.

We could simply create an empty ContextMenuHandlers key here, but this will
allow the New menu to work in the builtin explorer view once shellex handlers
are implemented.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=29523