Captain here. Actually it's a plug-in for Rhino that allows to export 3dm to GDL thus allowing the import in Archicad. Objects imported this way can make Archicad kind of sluggish, because being a polygonal software it has to do some process to hide a lot of edges and show a clean surface. The plugin was developed by Nikken Sekkei, a Japanese company where like 1000 architects work.