I'm gonna try to be actually helpful instead of shitposting for once.
So say you started in Sculptris and you made a 5million poly scuplt of your waifu's boobs. With all the little bumps on the nipples and everything. But you need to put this shit in waifu simulator2k4.exe right so you need to bake that shit for like a good 20 minutes. First thing you do is you open up your Blender and and shove that shit in there, and make it all lowpoly reopo. I'd tell you how to do it but I'm not a cromagnon so I don't use that shit. Anyway now you got your 5k waifu titties and they look like shit cause. So you unwrap it like a new sex toy from your boyfriend, normalmapped for your pleasure. Once you got it unwrapped this is where the tricky part happens.
Now you take your original 5m poly model and line it up exactly with your 5k reduced model. You save your low poly model as an OBJ and make sure that it saves the mapping coordinates that you made when unwrapping. You also save out your original highpoly again with the same settings to make sure the two objs match up. Then you pop open xnormal and follow this tutorial http://docs.cryengine.com/display/SDKDOC2/Ambient+Occlusion+and+Normal+map+bake+using+Xnormal
You're welcome anon. I'm high as shit.