Ok. Well that may answer one question ...
Can this even be done?
Reasons for not putting PHP on a Windows server, well if we were going to run it on a Windows server .Net would be preferred. There is currently no server available to run IIS on (would not want to install it on any of the DC's) and the application being built is so small it does not justify the addition of another server (it was going to be run on an mrtg box).
Thanks for the input, this will help steer me in the correct direction.