Hi Alex, so the thing that would be a little strange about that is this scenario - someone opens a .dxf file, works on it some and then closes MoI and pushes "Save changes" at the exit dialog. That would result in a new .3dm file being created and their original .dxf file would be unchanged which may be surprising.

I don't like to have surprising behavior in file handling so that's not something that I would want to have set up by default but I can make an option in moi.ini to enable that behavior.

- Michael