I don't think that is possible. As Rational diagrams consists of Classes/Objects and they need to be present before making the diagram. Word only stores the diagrams as images so Rational would not recognise it when you import it. You can however put diagrams from Rational to Word.
I have used the Unisys plugin and have exported the XMI. You can do it by going from Rational Rose File Menu -> Export XMI. I have then used the exported XMI in WSAD.
I have used the Unisys plugin and have exported the XMI. You can do it by going from Rational Rose File Menu -> Export XMI. I have then used the exported XMI in WSAD.