title: Install VC++ Runtime 64-bit if system is 64-bit
body: <p>I am creating a Visual Studio 2010 Setup project for installing my application. My application works by having multiple executable for different system bitness, and detects if you are running on a 32-bit or 64-bit system.</p>
  
  <p>I'd like to have the Visual C++ 2010 x64 Runtime installed by the installer if it is a 64-bit system. Setting this as a prerequisite, disables installation on 32-bit systems. Is there any way to set this as a prerequisite, but only on 64-bit systems, without resorting to two different installers?</p>