title: Cannot Open xaml.cs File in Visual Studio 2012
body: <p>I am attempting to open a <code>.xaml.cs</code> file in Visual Studio 2012, but double-clicking the file does nothing and right-clicking and selecting <code>Open</code> does nothing.</p>
  
  <p>If I attempt to open any other <code>.xaml.cs</code> file, it works fine - so it is isolated to a single file.</p>
  
  <p>For example...</p>
  
  <ul>
  <li>ImportUserControl.xaml - Opens fine</li>
  <li>ImportUserControl.xaml.cs - Won't open</li>
  <li>ExportUserControl.xaml - Opens fine</li>
  <li>ExportUserControl.xaml.cs - Won't open</li>
  </ul>
  
  <p>I have also tried opening the <code>.xaml</code> file in Visual Studio and selecting <code>View Code</code> too.</p>
  
  <p>What could cause this and how do I resolve it?</p>