The commands,

        ENCODING BASE64
        MODE BLOCK
        SEND [.GIF]BOATS*.GIF
        SEND/MODE=TEXT [GIF]INDEX.TXT

      set the default encoding to BASE64 and the default file
      reading mode to BLOCK. Any files matching the specification
      [GIF]BOATS*.GIF will be sent using these defaults. However, the
      file [GIF]INDEX.TXT will be sent as an ordinary text file owing
      to the use of the /MODE=TEXT qualifier.