title: Windows Phone custom shaders error?
body: <p>In Windows Phone XNA 4.0, I am receiving the following error when compiling: <em>the windows phone platform does not support custom shaders</em>.</p>
  
  <p>This is really annoying, because I have an Xbox 360 version of the project, and a Windows version of the project as well.</p>
  
  <p>I tried using the compilation based <code>#if !WINDOWS_PHONE</code> and <code>#endif</code>, but with no luck. It seems as if it ignores this.</p>
  
  <p>How can I make this file be excluded or ignored when compiled in the Windows Phone project?</p>