In this post Mike Taulty discusses Silverlight 4 and the COM interop feature.
I was reading Tim’s post over here on “Silverlight 4 with COM can do anything – on Windows” which referenced Justin’s amazingly detailed post with a bunch of COM interop examples from Silverlight 4.
A
Silverlight 4 beta application that has been explicitly installed as
trusted by the user can create COM objects if they have a registered
ProgId and if they implement IDispatch.