title: difftool - Only loading 1 version of gitfile instead of 2
body: <p>I'm trying to use <a href="https://www.inetsoftware.de/products/pdf-content-comparer" rel="nofollow">INET PDFC</a> as a difftool for comparing different versions of a pdf file.</p>
  
  <p><strong>Config file</strong></p>
  
  <pre><code>... 
  [diff]
      tool = pdfc
  [difftool "pdfc"]
      cmd = 'C:/Program Files (x86)/i-net PDFC/PDFC.exe' $LOCAL $REMOTE
  </code></pre>
  
  <p>When I run <code>git difftool HEAD HEAD^ &lt;filename&gt;</code> I only see 1 file.</p>
  
  <p>How can I load the two versions to this tool?
  Or should I use the .bat file? And how?</p>