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It's a legitimate file from EA, probably from the 1.3.13. You can tell by right-clicking on it and looking at the properties. It's updated when you close your gaming session, exact same time as the time on the ach. file. It's probably saving some info which can't be saved in an individual save game file, some Watcher info for instance.
MedievalMods and Sims3mods: Dive Cave Reset Fix, Resort Revamp, Industrial Oven Revamp, Will O' Wisp fix, UI Sounds Disabled, No Cars, Gnome Family Planner, Townies Out on the Town, No Martial Arts Clothes, Fast Skilling, etc.
http://simsasylum.com/tfm/