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