title: Issue opening pdf from VC++ application
body: <p>I am currently using</p>
  
  <pre><code>int nRet=(int)ShellExecute(NULL,
                             _T("open"),
                             _T("\"")+cPathToFile+_T("\""),
                             _T(""),
                             cDir,
                             SW_SHOW);
  </code></pre>
  
  <p>to open a pdf file from my VC++ application. The file opens correctly but then if I try to open another file from the explorer it doesn't show up. If I close the previuos opened file then all works correctly, as if the application was "locking" the pdf viewer.
  Is this a normal/known behaviour?</p>