Superclasses for Utilities, Global Utilities and Render Element plug-ins have been added in 3ds Max 4 so they can be accessed and manipulated in MAXScript.
The Utility and GUP superclasses were added to permit access to any static Function Published interfaces published by the utilities, but MAXScript was attempting to treat them as ReferenceTarget-based objects, which they are not. There is now a new base superclass, non_reftarget_maxwrapper_class that should be used for any new superclasses added whose classes do not live in the ReferenceTarget class hierarchy.
Render Element Manager
Plug In Manager