@Dietmar
Sorry, I'm not skilled enough to manually add a new exported function to vista 5048 ndis.sys
implementing this into ntoskrn8.sys won't do anything since it will never be called from there.
making an ndis.sys extender for this version won't work either since we don't have a vista beta DDK to link it to, and the vista RTM version of the ndis.lib library won't link it correctly.