Here is the registry information:
WallpaperChances are you will need to save the image as .bmp first
Then open the Windows Registry with Wine
Go to: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
Look for Wallpaper
Edit the path to your .bmp
I recommend putt it in Drive_C just to make it simple
Let me know if it works or breaks something
Aangepast door booman