[Maria-discuss] XtraDB using the Windows Installer

I have a couple of questions regarding XtraDB. 1. I am curious, if XtraDB is turned on / installed by default when MariaDB is installed using the windows installer on a Windows 2008 R2 server? 2. Is this default behavior the same in 5.1.53 and 5.2.6? 3. How can I tell if XtraDB is currently installed on any given MariaDB install? i.e. Is there a SHOW or other similar command I can run to confirm that XtraDB is installed?