This link gives (most of) the directories that are involved: https://support.arduino.cc/hc/en-us/articles/4415103213714-Find-sketches-libraries-board-cores-and-other-files-on-your-computer#boards.
I have shortcuts for the following directories
C:\Users\bugge\.arduinoIDE
C:\Users\bugge\AppData\Local\Arduino15
C:\Users\bugge\AppData\Roaming\arduino-ide
C:\Users\bugge\AppData\Local\arduino
C:\Users\bugge\AppData\Roaming\Arduino IDE