Corel DESIGNER and CorelDRAW share a common engine.
Corel DESIGNER X4 fully supports the CorelDRAW automation interface / commands and provides some more that are specific to the Corel DESIGNER exclusive features (e.g. callouts).
You can't use CorelDRAW macros files (*.gms) in Corel DESIGNER by just copying them into the Corel DESIGNER installation folder. You can use the components and modules instead to import them into a GMS files that has been created in Corel DESIGNER (created as empty text file and then opened with Corel DESIGNER VBA Editor to modify it).
So the first step you'll have to do is open the GMS files in CorelDRAW (where they have been created), export the modules and use those exported files as source modules for importing into the newly created GMS file in the Corel DESIGNER installation directory.
The automation interface in Corel DESIGNER X4 has been enhanced and extended. The Corel DESIGNER 12 macros should all work without the need to change anything.
Best regards,
Klaus.