Is there a <tag> to get to the files directory?

I followed the instructions on that page you gave me, including changing the error mapping in IIS for 404 and 405 errors to redirect them to index.php, and I pasted the following code into the bottom of my 'settings.php' file:

$sub_dir = "mhfanet"; // enter a subdirectory, if any. otherwise, use ""
$active = 1; // set to 1 if using clean URLS with IIS

// CODE
if ($active && strstr($_SERVER["QUERY_STRING"], ";")) {
  $qs = explode(";", $_SERVER["QUERY_STRING"]);
  $url = array_pop($qs);
  $parts = parse_url($url);
  unset($_GET, $_SERVER['QUERY_STRING']); // remove cruft added by IIS
  if ($sub_dir) {
    $parts["path"] = substr($parts["path"], strlen($sub_dir));
  }
  $_GET["q"] = trim($parts["path"], "/");
  $_SERVER["REQUEST_URI"] = $parts["path"];
  if ($parts["query"]) {
    $_SERVER["REQUEST_URI"] .= '?'. $parts["query"];
    $_SERVER["QUERY_STRING"] = $parts["query"];
    $_SERVER["ARGV"] = array($parts["query"]);
    parse_str($parts['query'], $arr);
    $_GET = array_merge($_GET, $arr);
    $_REQUEST = array_merge($_REQUEST, $arr);
  }
}

Now, when I run the clean URL's test, I got an error that simply says "No input file specified." If I can't get this to work right, I may just forget about it for the time being, or install Apache and try that.