Make Notepad++ Portable
It's on their FAQ but I can't find it anymore.
Custom Settings
To prevent re-opening of files, Settings, Preferences, MISC. and uncheck Remember current session for next launch.
How to Format XML
Did not need the extra steps just used plugin manager - http://geek.sylvainw.com/2010/03/28/using-notepad-to-quickly-format-xml/