I have a customer that sent me an OrCAD .dsn file which is supposed to
be a schematic file.  I was pointed to Cadence's web site to download
their ViewDraw Reader software which is supposed to be able to open and
print the schematic.  I am getting an error message which is leads me to
suspect that I may need library files besides the .dsn file in order to
open this file.

Any advice?

Thanks
Peter