File menu > Import > Select File To Import dialog > Files Of Type > AutoCAD (*.DXF)

If using a DWG file is not an option, the DXF file format is the next best method of getting design data to and from Autodesk VIZ. Most commonly, DXF files are used to import and export modeling data to and from CAD programs that have support for DXF but not DWG files.

When you import an DXF file, the software converts a subset of AutoCAD objects to corresponding Autodesk VIZ objects. Importing DXF files employs the same methods as importing DWG files. For more information, see Importing AutoCAD Drawing Files.