This property may be set or retrieved
When retrieved, the value is ID_Extension^^^&ID_Root&ISO"
When set, the supplied string is split into corresponding root and extension components, and stored in that form
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2