Finally, I had a hint somewhere else...
My server itself was not set to the right locale (country, language). But I tought Ajaxplorer overwrite and simply discard the locale set by the server OS.
- So under my windows server 2008 R2 I change United States to Canada and English for Français Canada.
- Restart Apache
- Set this value into bootsrap_conf.php define("AJXP_LOCALE", "fr_FR.ISO-8859-1");
Now when I check into the diagnostic tools under Ajaxplorer Locale is now define to French Canada instead of English_United States.
I am now able to browse under folder that contains french chars like é ç û and has well, interact with files.