Open DWF File
Design Web Format, after which the DWF extension is named, is a file format developed by Autodesk for the efficient distribution and communication of rich design data to anyone who needs to view, review, or print design files.
The Design Web Format was developed as a resolution and device independent drawing format for distributing designs.
It is not intended to replace popular CAD formats, but rather is used to save designs in a more accessible and open format that can be opened without the need to purchase expensive CAD software.