title: How do I fix "Unrecognized Guid format"
body: <p>I keep getting this error in VS 2013 if I click on the following file types:</p>
  
  <blockquote>
    <ol>
    <li>*.cs</li>
    <li>*.cshtml</li>
    <li>*.config</li>
    <li>*.asax</li>
    <li>*.html</li>
    </ol>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/1Bnfl.png" alt="enter image description here"></p>
  
  <p>I just recently updated to Visual Studio 2013 Update 2 and fixed a compatibility issue to always run the "<em>devenv.exe</em>" as administrator because of UAC issues and running a service in windows 8.1. However; I can turn around and open this entire solution in SharpDevelop 4.4 and there are no issues. That would lead me to believe that the solution file wasn't the issue and it points to VS 2013 being the culprit on some level.</p>
  
  <p>I have tried the following:</p>
  
  <blockquote>
    <ul>
    <li>devenv.exe /ResetSettings ( Did not work )</li>
    <li>Reset all settings to default without saving current settings ( Did not work )</li>
    </ul>
  </blockquote>