We got this bug filed against the Tour:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=183250
The point is, any tours should only show a desktop that came from Core.
Extras is enabled but not as clear to new users, so we would be showing
an application they can't "find" in the Core install, which leads to a
loss of credibility in our tour.
- Karsten