mình sửa  **file.module** đường dẫn theo đường dẫn **/modules/file**

 Returns HTML for an image with an appropriate icon for the given file.
 
 >* @param $variables
 >*   An associative array containing:
>    -file: A file object for which to make an icon.
 >*  - icon_directory: (optional) A path to a directory of icons to be used for files. Defaults to the value of the "file_icon_directory" variable.
> *   - alt: (optional) The alternative text to represent the icon in text-based browsers. Defaults to an empty string.
 
 >* @ingroup themeable
 

    function theme_file_icon($variables) {
      $file = $variables['file'];
      $alt = $variables['alt'];
      $icon_directory = $variables['icon_directory'];
      
      $mime = check_plain($file->filemime);
      $icon_url = file_icon_url($file, $icon_directory);
      $url = file_create_url($file->uri); /*Thêm đường dẫn file */
      return '<a href='.$url.'><img class="file-icon" alt="' . check_plain($alt) . '" title="' . $mime . '" src="' . $icon_url . '" /></a>'; /* Thêm link vào icon */
    }

Sau đó dùng css ẩn cái tên file là ok. 
Cảm ơn **Mahyar Farshi** đã chia sẻ.