This property corresponds to the XDSFolder.entryUUID attribute
This ID may be assigned by either by Source, Repository, or Registry
There is often confusion between this value and the UniqueID, and the Technical framework notes:
"The globally unique identifier (may be assigned by either by Source, Repository, or Registry) is primarily intended for use as a document registry management identifier. It is not meant to be an external reference for XDS Documents (e.g. in links within other documents). The uniqueId is meant for that purpose so that such links remain valid"
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