WindowsServer2003.WindowsXP-KB960652-x64

Server2003 and XP 64-bit has the same kernel version, i.e. they’re both identical inside

Downloaded links for rdpdr.sys:
x86: http://public.avast.com/~kurtin/patches/rdpdr/x86/SP2QFE/rdpdr.sys
x64: http://public.avast.com/~kurtin/patches/rdpdr/x64/SP2QFE/rdpdr.sys

Please let me know if it works for you, thanks.