Thanks for asking Game Engine developers for WinXP support!
I do not use Windows XP. But read this: Although I don't know many people I do know some who use Windows XP. Most of them with a laptop. Some of them also play computer games. I myself use a 32bit Linux system and play Windows games using Wine 1.6.2-20 which can at most simulate Windows XP. And that's quite enough! So that you understand me correctly: I am a power gamer! I have more than 300 games on GOG that work perfectly for me. I don't let anyone tell me when I should start using a newer operating system. And I laugh at individuals who think they know how many computer users use 32 bit systems. And I give all computer software developers a fair chance to develop software that could also be of interest to OURSELVES ;-)