If it is a 3DM file, you can convert if directly with Rhino (not iRhino) into OBJ or 3DS that can be imported into ArchiCAD.
iRhino is the iPad viewer for 3DM files from McNeel.
If you are on Mac, currently the beta-version of Rhino for OSX can be used freely and is quite complete, so you are able to do the conversion.
If you are on Windows, the trial from Rhino is save-enabled for 25 times, so you could use that to test the conversion a few times.
--- stefan boeykens --- bim-expert-architect-engineer-musician ---
Archicad28/Revit2024/Rhino8/Solibri/Zoom
MBP2023:14"M2MAX/Sequoia+Win11
Archicad-user since 1998
my Archicad Book