Determining windows version at runtime

[niobe]

Sorry if this is a simple question, I am totally new to Windows programming :)

I am packaging an installer which only requires a reboot if the Windows version is XP.

I can't see an inbuilt constant for Windows version in NSIS, what's the easiest way to get this from the system? Some arcane registry key?

thanks,

N

[kichik]

Inlcude WinVer.nsh and use ${If} ${AtLeastWinXP} and friends.

[niobe]

Too easy, thanks.