The save file data contains info via Skyrim.esm / Update.esm and any other plugins you are using, nothing from the exe or actual game code is stored there as far as I'm aware. (Format is a bit different but as with Morrowind the .ess file is basically a "mod" loading up the changes you've done to the game and your character to try and describe it fairly simple.) EDIT: Yes, quests, scripts, gmst, globals cells and all that (All modified records the player alters in his/her game.) are stored as modified from the save file, and are all part of Skyrim.esm or Update.esm originally. Code changes via Skyrim.exe (Or when said code is modified via SkyBoost / TesVal or similar.) should not be saved or stored in any way though such changes can affect the save game of course. Since such modified data can interfere with the how the game works or well how the game engine operates (Like say the example you showed or the typo error in the code from the first release of TesVal.) the behavior of the game changes accordingly, I notice a bit more stuttering with SkyBoost myself but it's improved a bit (It wasn't very noticeable to begin with though.) in this second r4 test release. (Being that it operates on the source code of Skyrim or well it's exe file or what to call it any mistake can be very severe although usually Skyrim just does that silent crash to desktop when it encounters such a bug.) I'm not that good at explaining so I apologize if I misunderstood you.