This little feature was introduced a couple of releases ago (maybe 2010) and at the time it was announced I was pretty excited about it since I frequently had to import PCB layout drawings from AutoCAD into SolidWorks and model them. 

Problem is, even though the checkbox is there in the Import DWG wizard,

that checkbox is never enabled and going to the online help just shows the control title but no text describing its function or how to use it.

I'm planning on opening a support ticket with my var, but, before I do, does anyone know more details about this control and functionality?