It affects all PC' versions. Yes. It means it may also break MODS. Duh check. Also, there is a function on the forums called search. It can be very helpful. I pref this DRM versus others. (bad stance, but its a hard place an a hard place to choose from.)
Im not saying it was cool of Steam to break LAA or anything, especially since it helps a lot of people when Bethesda is dikeing around getting a patch out, but complaining about not being able to use a 3rd party hack to modify files is kind of... silly.