title: php file_exists() return false on some directory on IIS
body: <h3>Environment:</h3>
  <ol>
  <li>php5</li>
  <li>windows2003</li>
  <li>IIS with fastCGI</li>
  </ol>
  <h3>Code:</h3>
  <pre><code>&lt;?php
  $p = &quot;i:\\tmp&quot;;
  if( file_exists($p) )
  {
      print $p . ' exists!';
  }
  else
  {
      print $p . ' not exists!';
  }
  ?&gt;
  </code></pre>