DIRED E of a directory via TCP

[David Vinayak Wallace <GUMBY@MIT-MC>]

    Date: Thu, 2 May 85 18:26 EDT
    From: David A. Moon <Moon at SCRC-STONY-BROOK>

        Date: Thu, 2 May 85 06:54 EDT
        From: David Vinayak Wallace <Gumby at MC>

        In Symbolics 3600 Zwei in Release 6.0, IP-TCP 29.0, AISite 9.0,
        microcode TMC5-MIC 319, on Lisp Machine Jimi Hendrix:

        I was DIRED'ing my directory on su-csli via TCP.  I typed "E" on a line
        containing a directory.  It read the directory as a file.

    I expect this means that SU-CSLI didn't tell it that the thing in
    question was a directory.  Probably the TCP FTP protocol, which is
    pretty dumb, doesn't provide any way to convey that information.  The
    Lisp machine can only know what the foreign host tells it.

Would it be too interlisp-y to guess that tops20 files of type DIRECTORY
with a file-length of 0 are directories?