Updating to SC2 Heart of the Swarm 3.0 will delete your maps and mods folders from your directories, which is very similar to an older issue they had. Make sure to make backups.
Vrael shouted: I almost had a heart attack just thinking about calculating all the offsets it would take to do that kind of stuff
With the modern EUD editors, I don't think they're calculating nearly as many offsets as you might imagine. Still some fancy ass work that I'm sure took a ton of effort