The problem is associated with the REDIR subdirectory file located in the
AppleShare PC DIR. In all probability, your customer is using an
AppleShare PC version older than 2.X, which works effectively only with DOS
versions through the 3.X series. Your customer needs to upgrade to the
more current Farallon version of the AppleShare PC software.
This error message also has been reported by customers when they haven't
properly followed the directions for loading files for DOS 5.0. The
customer should pay close attention to the instructions regarding
"expanding" (see the DOS 5.0 User's Manual, page 28).