When you open a Land Desktop drawing in AutoCAD Civil 3D, AutoCAD Civil 3D does not convert the data. However, you can view Land Desktop objects in AutoCAD Civil 3D as proxies or as objects.
When you open a Land Desktop drawing in AutoCAD Civil 3D, the following occurs:
Each drawing is associated with various settings that are specific to Land Desktop, which are stored in an external file named <drawing name>.dfm. This data is not brought forward into AutoCAD Civil 3D.