title: Visual Studio needs to make non-functional changes to this project
body: <p>I opened a C# project that was created in VS 2010 SP, with VS 2012. A one-way conversion window appeared where I proceeded with the conversion.</p>
  
  <p>Upon completion I got the following warning:</p>
  
  <blockquote>
    <p>Visual Studio needs to make non-functional changes to this project in
    order to enable the project to open in this version and Visual Studio
    2010 SP1 without impacting project behavior.</p>
  </blockquote>
  
  <p>...but it doesn't say <em>which</em> non-functional changes. Can someone clue me in?</p>