I used the WDK version 5340 and built using the same WDK, mux.sys and mux.dll
from the sample provided as in:

\WinDDK\5340\src\network\ndis\mux\driver

I tried to install the driver as a protocol mux driver per mux.htm
instructions on a LongHorn system.

The mux.sys, mux.dll, mux_mp.inf and muxp.inf are all located in the same
folder
supplied to the installer via the "Have Disk" selection prompted selection
path.

However, I still got the error:
" Cannot find any drivers for this device".

Any clue to this problem is most welcome.

Thanks,

YC