Say you are (an idiot) like me, and after playing around with modifying a sculpty you've been working on you remapped the UV and saved that off....and then forgot to save the file. Since Blender doesn't prompt to save new versions when you've changed something, sometimes you accidentally screw yourself.
Step one: curse profusely. Step two: do a google search and find these plug ins (if you can't see the forum post for whatever reason, here's the download link (and thank you, Domino Marama).
Drop those files in your Program Files\Blender Foundation\Blender\.blender\scripts directory (only the import_sculptie.py is required for importing, however the others may be useful!), and there should be an option in your File->Import dropdown that makes the magic happen. Yay! Once again, watch for that option popup (read the readme attached for what the options do, this time some of them actually are useful to change sometimes, although it defaults to what you usually want to work with, assuming sphere mapping and less pain with seams).
If you change your sculpt and need to remap it any, you will have to add a new material (F5), set to Texface, add three new textures set to blend (F6), and set them (F5) to: x, blank blank, red 1.0, Add; y, blank, blank, green 1.0, Add; z, blank, blank, blue 1.0, Add, and then Bake (F10) Textures, going through the normal material setup (I've gone over that in more detail before if this is too sketchy for you, however, these are the reminder for the things that need to be hit). Once the new materials are added and set up, hit that big Bake button, as you should know by now, to make with the flavour rainbow- and now we're back to just as if we hadn't lost it all in the first place. (One can also use Rokuro for the basic shape and import for making it a less regimented shape in this way, so if we wanted to not admit I'm an idiot, we would use this as the excuse for figuring it out instead.)