Bugger!
I started wondering today if it might be possible to identify components/resources in XP, after all Mach3 seems to be a 'native' XP app.
Any added functions in later windows releases are probably not required and could therefore be left out.
To the best of my knowledge the best source of documentation about the supported functions in XP come from XP Embedded software docs.
Any XP features not required by Mach3 is a different matter...
Thanks for your reply, I'm not quite alone!