Overrides registry hives and allows data to be imported into those hives for the current process.
The following registry hives are supported. HKEY_CLASSES_ROOTHKEY_CURRENT_USERHKEY_LOCAL_MACHINEHKEY_USERS Only a single instance of this class may be active at a time. Overriding registry hives is a per-process operation so modifying the registry key overrides may corrupt other threads.