Fileinfo always returns wrong MIME type

[ppowell]

if (!function_exists('mime_content_type_fileinfo')) {
 /**
  * Will use {@link http://us2.php.net/fileinfo FileInfo} functions provided within {@link http://pecl.php.net PECL} bundle to return mime type
  *
  * @param string $file
  * @return string $mime_type
  * @see mime_content_type
  */
 function &mime_content_type_fileinfo($file) {
	global $windowsMagicMimePath, $mimeTypeFilePath;
	$mimePath = (($_ENV['windir'] || $_SERVER['windir']) && $windowsMagicMimePath) ? $windowsMagicMimePath : $mimeTypeFilePath;
	if ($_ENV['windir'] || $_SERVER['windir']) $mimePath = preg_replace('/\.mime$/i', '', $mimePath);
	print_r("mimePath = $mimePath\n");
	if (class_exists('FileInfo')) {
	 $finfo =& new FileInfo(FILEINFO_MIME, $mimePath);
	 if (is_object($finfo)) {
	  return $finfo->file($file);
	 } else if (function_exists('finfo_open')) {
	  $mime = finfo_file(finfo_open(FILEINFO_MIME, $mimePath), $file);
	  if ($mime) return mime; else return mime_content_type($file);
	 } else {
	  return mime_content_type($file);
	 }
	} else if (function_exists('finfo_open')) {
	 $mime = finfo_file(finfo_open(FILEINFO_MIME, $mimePath), $file);
	 if ($mime) return $mime; else return mime_content_type($file);
	} else {
	 return mime_content_type($file);
	}
 }
}

Environment:
WAMP 5.0, WinXP, PHP 5.2.0, Apache 2.0

Whenever I run this function within SAPI PHP, though I have added this line to php.ini:

extension=php_fileinfo.dll

And restarted web services, class_exists('FileInfo') is always false, furthermore, function_exists('finfo_open') is also always false

That I absolutely do not get

However, in CLI PHP, class_exists('FileInfo') is still false, however function_exists('finfo_open') comes back true this time

But, if I try to use this line on a JPEG image:

echo finfo_file(finfo_open(FILEINFO_MIME, 'C:/wamp/php/extras/mime'), 'C:/images/blah.jpg');

I wind up instead of 'image/jpeg', this instead:

application/x-dpkg\015

Anyone who knows how to use FileInfo is welcome to play around with the function to make it fit, but it defaults to mime_content_type() otherwise, even though it's deprecated.

Thanks
Phil