title: Unity3d - Failed to load 'Assets/Plugins/QCARWrapper.dll'
body: <p>I want to use c++ dll on unity android application. To use native dll on a android device, I learn that I should use Unity 5. I download unity5 from <a href="http://unity3d.com/get-unity">here</a>. My application requires vuforia. So I download vuforia package from <a href="https://developer.vuforia.com/downloads/sdk">here</a>. </p>
  
  <p>Unity 5 is 64 bit.</p>
  
  <p>On unity editor, I delete <code>MainCamera</code> and add <code>ARCamera</code>. There is an error message on unity console. The message is below :</p>
  
  <pre><code>Failed to load 'Assets/Plugins/QCARWrapper.dll', expected 64 bit architecture (IMAGE_FILE_MACHINE_AMD64), but was IMAGE_FILE_MACHINE_I386.
  Vuforia.WebCamAbstractBehaviour:CheckNativePluginSupport()
  </code></pre>
  
  <p>There is a solution for this problem on <a href="https://developer.vuforia.com/forum/vuforia-40/unity-5">vuforia forum</a>. But I don't find <code>unity editor(32 bit)</code></p>