[mmorse]

You can now drag n' drop in the prism window, but I gather your talking about the install.rdf in the DnD add-on in general :

<RDF:Description RDF:about="rdf:#$xPlhO3"
                   em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
                   em:minVersion="1.5"
                   em:maxVersion="3.0b3" />