(form "00914" (size 63  6)
  (heading "SELECT DATABASE DEFINITION FILE")
  (label (position  2  3) (text "Filename"))
  (field "filename" (position 18  3) (display_length 36) (input allowed)
    (max_length 256)
    (file (extension trim "*.ddb,*.sdb")))
  (default_buttons)
)