I downloaded a couple of Meridian files from the Pronto section, that's how I could tell that they use RC-5 signals. I don't have RC-5 signals notated on the file that I have here at work, but I do have a file at home that has some RC-5 signals listed on it, it's just a question of whether the device codes in the 15-1994 that use RC-5 have the right device codes in them (which looks likes it's device 19).