(form "50103" (size 51  6)
  (heading "DEFAULT SETUP MODIFICATION")
  (label (position  5  3) (text "Format File"))
  (field "format_file" (position 20  3) (display_length 26) (input allowed)
    (null disallowed) (max_length 26)
    (file (extension trim "*.fmt"))
    )
  (default_buttons)
)