First Hi. Im totally new here and definitly dont know how anything here works, so please be kind.My Problem is, I have an 2D .dwg file, here a little part of it: http://gyazo.com/46660298dd4a5474513633cc3f6fd524 (I cant show you the whole because of security issues), and how you can see there are only the qm units, and I have no Idea how to get them that I can see the whole length nad width of everything and not only the qm. In want to make an 3D Model of this plans, and there for I need the exact lenght and width of every room.I hope anyone understands what I mean, sorry for the bad English.regards, Felix

Not very detailed is it?  How did you expect to create a 3D drawing from that?

I figured something out, still thanks

You can read it with one of the GIS products from Autodesk i.e. map3d, civil3d, mapguide. If there is an item in your dwg that is identifiable on the ground or another map, you can open the dwg with a free viewer (autodesk trueview), identify the coordinates at the known point and then begin to ascertain the correct prj.