(form "reorder_swa" (size 45 5)
  (heading "Reorder Triangles in a File")

  (field "input_filename" (position 2  2) (display_length 40) (input allowed)
    (max_length 255)
    (file (extension "*.dtm"))
  )

  (field "output_filename" (position 2  3) (display_length 40) (input allowed)
    (max_length 255)                  
    (file (extension "*.dtm"))
  )
)