exsup.lib for 64 bit

I am compiling my driver for amd 64 bit and ia64 bit, and it is complaining
that exsup.lib is missing during the link stage. I have ddk 3790,
3790.1159, 3790.winhec03 and the wdf ddk installed and none of them have
this file. Any ideas what could be wrong?

LINK : error LNK1181: cannot open input file
‘C:\dev\bldtools\3790\lib\wnet\amd64\exsup.lib’

Thanks,

Rob