[madcat]

This more or less says it all but what I think your friend is confused over is Microsoft's Emulator program thing (Windows Virtual PC) that you can use to run a virtual emulation of windows XP. Home doesn't have or allow you to install Windows Virtual PC and that's what I think he's got confused with backward compatible. I'm running Win 7 Pro 64bit and only one program out of all the software, game's ect... I used on Win XP that I couldn't get to work and had to use Virtual XP and that's not related to anything IL-2.