ftp://ftp.microsoft.com/developr/drg/RPL-ROM/rplrom.zip

    Microsoft LAN Manager 2.1 RPL Tools and Specification

    This archive contains the Microsoft(R) LAN Manager 2.1 RPL Tools. It is 
    contained here since it is no longer available in any current DDK. In 
    addition to the contents of the original RPL Tools disk, also included 
    is an online version of the RPL specification. This files are unsupported, 
    and provided as an assistance for the advanced programmer.