title: select multiple files in CFileDialog
body: <p>In VC++ 6.0, MFC I want to select a multiple files</p>
  
  <pre><code>CFileDialog opendialog(true); // opens the dialog for open;
  opendialog.m_ofn.lpstrTitle="SELECT FILE"; //selects the file title;
  opendialog.m_ofn.lpstrFilter="text files (*.txt)\0*.txt\0"; //selects the filter;
  
  if(opendialog.DoModal()==IDOK) //checks wether ok or cancel button is pressed;
  {
      srcfilename=opendialog.GetPathName(); //gets the path name;
      ...
  }
  </code></pre>
  
  <p>The code sample above allows only a single file being selected at a time, but I want to select multiple text files, for example by holding down control key (<kbd>ctrl</kbd>+select the multiple files). How can I achieve this?</p>