title: C++ cannot open source file
body: <p>In C++ with Visual studio 2017, </p>
  
  <p>I copied some header files into my project folder, then added them under the "solution explorer" in c++. Now when I write </p>
  
  <pre><code>#include "name.h"
  </code></pre>
  
  <p>it prints an error under include, and says "cannot open source file". </p>
  
  <p>Why, and what can I potentially do to fix it?</p>
  
  <p>I only just downloaded VS and am learning c++ for the first time.</p>