This dialog box lets you set some options when exporting to DXF.

Include DXF Header

Check to include the DXF header, which is generally optional. The options in the Data Format area are enabled when this option is checked.

Polyline - Lines Only

This option converts all the vector paths into polylines, so bezier curves and arcs are converted to lines. You can specify the arc resolution for this conversion, which is the number of degree along an arc that a single line would represent in the DXF file.

Polyline - Lines and Arcs

This format produces files containing both lines and arcs in the "polyline" format. This is the preferred format most of the time.

Separate Arcs and Lines (Exploded)

This option creates a file where each arc and line in the vector path is converted to a separate arc and line, the so-called "exploded" format.

Millimeters

This creates a file using millimeters.

Inches

This creates a file using inches.

Cleanup Vectors

Check this to clean up the vector data before exporting.