I've already pretended to be a C++ programmer again. Thanks. However, perhaps this isn't the forum for this question, but since it is related, I'll go ahead and describe another thing that has come up:
After I load the sample, arxdragdrop, drag-and-drop from external apps into ACAD seems to be broken. When I drag i-drop content in after loading the arx app, I get a menu with the items 'List Files' and 'Cancel' instead of the drag-and-drop sequence (it works fine BEFORE loading the arx app). It seems to be going through the droptarget.cpp code WITHOUT a call to acedStartOverrideDropTarget() that only gets called when initiating a drag-and-drop from the arx-created window.
thanks in advance, Chuck