"extended support" for windows 2000 server ends in a few months, mainstream support ended 5 years ago:

 http://support.microsoft.com/lifecycle/?LN=en-us&x=8&y=9&p1=7274

That, IMNSHO, implies that python 2.7 and 3.2 should not bother supporting win2k.

Regardless, I'd imagine we can look the particular constants in question up and hard code the values when the header files don't define them for us (that is also the obvious workaround for anyone needing them in code today).