Hi Rob, yeah currently style information is not exported by MoI into 3DS format.

3DS format is a really pretty antiquated and limited format - it comes from the old 3D Studio MS-DOS version and has several 16-bit era limits in it. Also a major problem with it is that it does not have any way to store shading vertex normals in it.

So I usually only recommend it as a kind of last resort.

It looks like archicad is possibly only focused on imports in DWG, DXF, and 3DS imports? It seems like they have gone for an almost exclusively Autodesk oriented compatibility which seems kind of strange...

Maybe I'll be able to add styles export to 3DS in MoI v3, but I kind of hate to devote much effort on 3DS since it is just not a good format really.

- Michael