Is globaltheme.xml is available as a part of the package for FSM 5.6.3 version? (I searched for this xaml file in application server in c:\inetpub..\clienttest folder but could not locate. Should I look somewhere else)

If not then how can we customize the login screen in 5.6.3 version (smart client)?

I am looking add few fields and some more text to the application launch screen along with customer branding. Understand that this is available in higher versions but my client is still stuck in this old version.