title: Cannot Open Metadata file iostream in C++
body: <p>I just downloaded Visual Studio 2012 and when I started my preprocessor directive </p>
  
  <pre><code> #using &lt;iostream&gt;
  </code></pre>
  
  <p>I get an error message saying "Error: cannot open metadata file "iostream". Anyone know what might be causing this issue? Thanks so much!</p>
  
  <p><img src="https://i.stack.imgur.com/Zd5ef.jpg" alt="enter image description here"></p>