(form "20011" (size 57  6)
  (help "20011_TIP_0")
  (heading "SELECT CONSTRAINT FILE")
  (label (position  2  3) (text "Constraint"))
  (field "modname" (position 15  3) (display_length 40) (input allowed)
    (translate lower) (null disallowed) (max_length 40)
    (file (extension trim "*.con"))
  )
  (default_buttons)
)