Mammon's APJ #3 article "Extending NASM"
http://www.eccentrix.com/members/mammon/Text/nasm_apj.txt
Unfortunately the macros.asm he refers to is no longer accessible
through the link he provides. However, for each HLL feature
implementation he discusses, he provides his macro code right in the
tutorial.
Nagoa+.inc:
http://sapp.telepac.pt/win32asm/NAGOA+.zip
I had to comment out the macro definitions for WORD and DWORD, as they
are already defined in win32n.inc