According to the following how-to you need to copy some files too. Did you tried that already?http://wptidbits.com/webs/enable-php-ldap-module-in-xampp/Unfortunately I am not so experienced with XAMPP, but basically that is no osTicket issue itself, rather than an XAMPP issue. So as an additional suggestion, I recommend to search the web as well as the osTicket forum here ;)