Since everypony else has done it already... eh, why not.  And yes.  It's Fallout, if it happened to My Little Pony: Friendship is Balefire --- er, Magic.

Here we see that Cherry Pie, the protagonist of New Pegas, has found a holorecorder...

FWIW, this fic can be found at http://www.fimfiction.net/story/679/Fallout-Equestria%3A-New-Pegas .  Based on the literally epic (it's longer than goddamn Lord of the Rings) "Fallout Equestria" by Kkat, this is the New Vegas treatment.