With Filestar you can easily convert SFW to DXF. Accessible directly in your right click menu for single or batch SFW processing. How to convert SFW to DXF:
1. Download and install the latest version of Filestar. (https://filestar.com)
2. Right click on one or more SFW file(s) on your desktop and select Convert with Filestar.
Type "convert dxf" in the search box.
3. Press Run.