Hi Alex, so the reason why the current file name isn't set when you open something other than a .3dm file is that only .3dm files can contain everything that you create in MoI.

So for example if you open a .dxf file and then add a background image, if MoI set the current file name to that .dxf file and tried to save out to that same .dxf file when you closed MoI, it would appear to the user as if their background image was saved while in fact it was not.

But are you asking for MoI to save to a .3dm file in that situation and not the original opened file type? That seems like a little unusual file handling behavior to me but it could be possible to make an option to do that I think.

- Michael