title: Intellisense cannot open source file "*.h"
body: <p>I have no idea as to what may have happened. I was removing a few libraries I added to the VC folder and from Additional Dependencies (OpenGL libraries I've added), then when I tried to compile my program, I received 100 errors. The problem is that my current project is not recognizing some of the standard headers. Here is what I've got:</p>
  
  <pre><code>#include &lt;Windows.h&gt;    &lt;-----Error from title
  #include &lt;stdio.h&gt;      &lt;-----Error from title
  #include &lt;stdlib.h&gt;     &lt;-----Error from title
  #include "stdafx.h"     &lt;-----OK
  #include &lt;CommCtrl.h&gt;   &lt;-----Error from title
  </code></pre>
  
  <p>I've created a new project to compare it's properties, but didn't notice anything missing. Does anyone have an idea as to why project isn't using these headers?</p>