How to detect Windows 8 ?

[alex0001]

Hello,
can somebody please tell me how can i detect if a NSIS 2.46 setup file is running under Windows 8 ?

I have made a context menu dll for the windows explorer and want to install the Visual C++ 2012 redistributable packages only if Windows 8 is installed.

I know the rest,i simply do not know how to detect the version of Windows.

Thank you !