GetProductInfo

[DllImport("Kernel32.dll")][return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetProductInfo(
   uint dwOSMajorVersion,
   uint dwOSMinorVersion,
   uint dwSpMajorVersion,
   uint dwSpMinorVersion,
   out uint pdwReturnedProductType
);

Microsoft documentation: Link