I'm sorry Mayo. The program does not output dxf files. Hope you didn't spend to much time trying to figure that part out. It had been a while since I used the program and forgot how I had used the Shopbot to cut out boxes. After designing the box I would print the drawing to a pdf file. I then imported the pdf file into Aspire and and scaled the drawing to full size. Then I just saved the file to the Shopbot post processor and cut out the box (or boxes) I was needing.
There are different ways to do this:
If you print to a PDF file, then open the .pdf in Adobe Illustrator, the drawing will be in scaleable vector format which you will be able to scale to full size, save in Illustrator or re-export to Autocad etc.
Not as hard as it sounds and only takes a minute or so after you do it a couple of times. Maybe this option to export to dxf will be a future upgrade.
Again, I am sorry for steering you in the wrong direction.