Folder: Skyrim
Files:
installscript.vdf
ControlMap_Custom.txt
TESV.exe
SkyrimEditorPrefs.ini
Editor Warnings.txt
RenderInfo.txt

folder: Skyrim/Data
Files:
Skyrim - Misc.bsa
Update.bsa
update.esm

Folder: Skyrim/Data/Interface
Files:
Translate_ENGLISH.txt

Folder: Skyrim/Data/strings
Files:
Update_English.DLSTRINGS
Update_English.STRINGS

Folder: Skyrim/Logs/Script
Files:
EditorPapyrus.0.log
EditorPapyrus.1.log

Useful to know.