public function Content()
    {
        $content = $this->owner->Content;

        // Internal links.
        $matches = array();
        preg_match_all('/<a.*href="\[file_link,id=([0-9]+)\].*".*>.*<\/a>/U', $content, $matches);

        for ($i = 0; $i < count($matches[0]); $i++) {
            $file = DataObject::get_by_id('File', $matches[1][$i]);
            if ($file) {
                $size     = $file->getSize();
                $ext     = strtoupper($file->getExtension());
                $newLink = $matches[0][$i] . "<span class='fileExt'> [$ext, $size]</span>";
                $content = str_replace($matches[0][$i], $newLink, $content);
            }
        }

        // and now external links
        $pattern     = '/<a href=\"(h[^\"]*)\">(.*)<\/a>/iU';
        $replacement = '<a href="$1" class="external">$2</a>';
        $result         = preg_replace($pattern, $replacement, $content, -1);
        return $result;
    }