The GUID property of a Reference object returns a GUID that identifies a type library in the Windows Registry.
Setting
The GUID property is available only by using Visual Basic and is read-only.
Remarks
Every type library has an associated GUID which is stored in the Registry. When you set a reference to a type library, Microsoft Access uses the type library's GUID to identify the type library.
You can use the AddFromGUID method to create a Reference object from a type library's GUID.