/EXTRACT=filename.MSGHLP

    Extracts messages from the database and generates a .MSGHLP file
    that can be edited, if desired, and used as input for /INSERT and
    /DELETE operations. /EXTRACT retrieves data from a .MSGHLP$DATA
    file or logical search path specified by /LIBRARY or, by default,
    from files in the search path defined by logical name MSGHLP$LIBRARY.
    When /EXTRACT is not specified, Help Message produces output in
    standard text format by default (see /OUTPUT).