Hi Stefano, no not really. MoI doesn't currently have an option for converting curves into a sequence of arcs, you have an option for exporting curves as either SPLINE entities (using either the exact same NURBS geometry or as "cubic splines" which can be more friendly for 2D vector illustration programs), or converted to line segments in the form of a polyline.

Another thing that's different is if you export a model with solids in it, it will generate a hidden line drawing and export that drawing to the DXF file.

Also MoI doesn't have options in the UI for controlling which AutoCAD version it is targeting, it just targets ACAD2000. But that's quite old, I would be surprised if it wasn't supported by your CAM software. If not then it could be possible to modify the version by changing the DXFExportTemplate.dxf file which is in the UI subfolder of the MoI install. When MoI does a DXF export, it reads in that template file and then fills in the entities section of it. Things like the AutoCAD version are in the header of that template file. So if you change the DXFExportTemplate.dxf to an AutoCAD R12 .dxf file then MoI would write out an R12 file. That is a super ancient version though.

MoI does not target R12 for DXF output because some entity types like ELLIPSE and maybe SPLINE (not sure) did not exist in AutoCAD R12.

- Michael