short version of the question is
In VB when I recompile an ActiveX DLL project I can ensure Binary
compatibility with a previously released version of the same DLL by using
the binary compatibility property setting and using a reference to a copy of
my "released" DLL. How can the same thing be done with a Visual C++ 6.0
Project ?

I realize it's probably a dumb question but, hey I'm just a VB programmer
with very little C++ knowledge and I've gotten 3 versions of a DLL (created
in VC++ 6) from a supplier and none of them have been compatible with the
previous version ( even though the IDL interface extracted by OLE View
appears to be Identical.)
Thanks for any help,
Dave