Seeing as these are just "CAD Drawing" details, even if it was in Archicad format, all you would have is a bunch of lines.
And to save in Archicad format would mean you would have a whole PLN file with a few lines in it as well as a whole bunch of attributes that may mean nothing to you - or maybe it could be saved as just a MOD file which won't have the attributes.
Either way the DXF/DWG works just as well, so that is why probably why there is no Archicad file.
3D objects or materials (with textures and fills) would be a different matter.
These are best in Archicad format - although we can import other 3D formats and it is fairly easy to make a basic material if we can get a decent texture image.
Barry.
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