How to use .lgh files in Wildfire 5

Now that we've upgraded from Wildfire 3 to Wildfire 5, one of our users says that he can no longer use his .lgh files (lighting).
He says he cannot figure out where to import/apply it.
I've never used any lighting stuff, so I can't help him.
Did this functionality chnage/move in Widlfire 5?

Gerry