The “Screen” folder contains wallpapers that are used by default for the Lock screen. The “4K” folder has the default Windows 10 wallpaper in lots of different resolutions, even for vertical screens. Inside the Web folder, there will be three more folders: 4K, Screen, and Wallpaper.This will require quite a bit of scrolling, so you can alternatively hit “W” on your keyboard to speed up the process. Scroll down until you find the “Windows” folder and enter it.The one you’re looking for has a Windows logo next to the partition. Locate the Windows partition and open it.Doing this isn’t all that complicated, but it is divided into lots of folders due to a variety of preinstalled themes: