There's no file that addresses it, but if you believe that you can control your own luck, then maybe the Lucid Dreaming file would be something you could use for that purpose. If you believe that Luck is something your subconscious can direct, then maybe in a Lucid Dream you're in sort of a self-hypnosis state where you're experiencing your imagination very vividly (whatever Lucid Dreams are, I would think they'd affect you the way hypnosis would).
I'm not sure how a file specifically affecting Luck would be worded. You can suggest that someone be more confident, but how do you suggest that something better will happen to that person without their active participation in it?