Wallpaper file
Registry key: HKEY_CURRENT_USER\Control Panel\Desktop
Parameter: Wallpaper
Type: string
Description: This key contains full path to wallpaper file. Use the same key at "HKEY_USERS\.DEFAULT\" hive to set this option for all new users.


Tile wallpaper
Registry key: HKEY_CURRENT_USER\Control Panel\Desktop
Parameter: TileWallpaper
Type: string
Description: To tile wallpaper set this value to 1. Use the same key at "HKEY_USERS\.DEFAULT\" hive to set this option for all new users.


Wallpaper style
Registry key: HKEY_CURRENT_USER\Control Panel\Desktop
Parameter: WallPaperStyle
Type: string
Description: To center wallpaper set this value to 0. 1- multiple pictures on desktop; 2 - stretch the wallpaper to fit the desktop. Other values - no wallpaper. Default is "0".


Vertical offset of wallpaper
Registry key: HKEY_CURRENT_USER\Control Panel\Desktop
Parameter: Wallpaperoriginy
Type: string
Description: This key contains the vertical offset of wallpaper. It is the offset from the center of Desktop, so it can be any positive and negative values.


Horizontal offset of wallpaper
Registry key: HKEY_CURRENT_USER\Control Panel\Desktop
Parameter: Wallpaperoriginx
Type: string
Description: This key contains the horizontal offset of wallpaper. It is the offset from the center of Desktop, so it can be any positive and negative values.