Vista drag and drop

Can someone please help me out?

Application A runs with medium security permissions on Vista.

Application B runs as a Browser Plugin in IE on the same machine.

IE runs with low security permissions on Vista.

Application A will not accept "drags" from application B because Vista prevents lower security applications from giving data (and potentially hurting) higher level applications. In theory this is a nice thing to do.

If you add some registry settings, A can accept "drags" from IE -- woo hoo.

Here is the problem: B sometimes starts its own "drags" and A won't accept them (even though A accepts drags that IE started)

Any ideas? (disabling protected mode does work, but is not really a solution)