To choose pictures from existing themes you only need to find the folders where the themes are located. The images aren't embedded - they're just hanging out loose in a theme folder.
Look in these locations:
C:\Windows\Web\Wallpaper
C:\Users\your-name\AppData\Local\Microsoft\Windows\Themes\
To choose pictures from existing themes you only need to find the folders where the themes are located. The images aren't embedded - they're just hanging out loose in a theme folder.
Look in these locations:
C:\Windows\Web\Wallpaper
C:\Users\your-name\AppData\Local\Microsoft\Windows\Themes\