As a long Archicad User, I remember that there was one time that there was an Autocad plugin, that was provided by Graphisoft (correct me if I´m wrong) that was used to provide GDL objects to Autocad users.
I believe that Graphisoft should provide that thing (whether it was a plugin or API) so that the programming individuals or teams can incorporate Archicad GDL objects to their preferred software application
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