====Good====

HKEY_LOCAL_MACHINE\System\Foo\Bar
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node
HKEY_CLASSES_ROOT\SYSTEM\system32\config\system
HKEY_CURRENT_USER\SYSTEM\system32\config\system
HKCU\SYSTEM
HKLM\Short\Name

====Bad====

HKP\SYSTEM
