WordPress plugin that removes evil characters in file names

sunnytize.php

<?php
/*
Plugin Name: Sunnytize
Plugin URI:
Description: A better file name sanitizer
Version: 1.0
Author: Sunny Ripert
Author URI: http://sunfox.org
*/

function sunnytize_file_name_chars($special_chars, $filename_raw = '') {
  return array_merge($special_chars, str_split('éè’ààäçéèêöôùûü£€%@+«»°'));
}

add_filter('sanitize_file_name_chars', 'sunnytize_file_name_chars');


function sunnytize_file_name($filename, $filename_raw = '') {
  return strtolower($filename);
}

add_filter('sanitize_file_name', 'sunnytize_file_name');

Just add lowercase.