Has anyone tried this game with Windows XP? Just wondering since it says DX9 if it works.

Does not run even on Vista, spits error "The procedure entry point GetLogicalProcessorInformationEx could not be located in the dynamic link library KERNEL32.dll." This function made first appearance in Windows 7.

I don't have old DirectX 9 GPUs around, but the game works on virtual machine. I was able to test this on VMware Workstation 11, which is the last version before DX10 support was added. With this arrangement and Win7 as a guest OS, it ran very slow, but worked.

Worth mentioning also that the game comes with only 64-bit executable.