New answers tagged xbox
The save file format used in Skyrim for Xbox, once it has been extracted from the Xbox save file container file, is identical to the format used on PC and only needs its file extension changed from .dat to .ess. The game engines are also identical. So the answers to your questions are yes, yes, and yes.
There is a similar question: How to change skin to Batman Beyond? It should be mentioned that at least in the Joker's challenge rooms you can change your costume before finishing the game.
If you buy a game you can play it on all profiles on your console.
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