To show hidden files on your Vu STB, with DCC, you must connect to your STB, make expert selection, and then click mark the field hidden files ( it will show hidden files ) including directory.
the .xbmc directory is on the root of your media/hdd.
The navi-x addon it will be on \media\hdd\.xbmc ( sub directory addons ).
By the way, if you don´t have DCC ( last version ), you can dowload it, at the post:
http://www.vuplus-community.net/board/threads/new-dcc-e2-1-42.3427/#post-159621
best regards
nunigaia