Change the Desktop Wallpaper
# HKEY_CURRENT_USER\\Control Panel\\Desktop\\WallpaperStyle
# HKEY_CURRENT_USER\\Control Panel\\Desktop\\TileWallpaper
Center
* WallpaperStyle = 0
* TileWallpaper = 0
Tile
* WallpaperStyle = 0
* TileWallpaper = 1
Stretch
* WallpaperStyle = 2
* TileWallpaper = 0
clipped from: www.geekgirls.com
A sample REG file
REGEDIT4
[HKEY_CURRENT_USER\Control Panel\Desktop]
"DragFullWindows"="1"
"FontSmoothing"="0"
"wallpaper"=""
"TileWallpaper"="0"
"ScreenSaveTimeOut"="900"
"UserPreferencemask"=hex:be,00,00,00
"WallpaperStyle"="0"
.........................................
How to Use Policy Settings and Preferences
Applications commonly include a user preference and a policy setting that perform similar or related functions. For example, you might want to offer users the ability to configure part of a component through a user preference setting, and also centrally control this setting by using a registry-based policy setting.
An example of where both a policy and preference can co-exist is the configuration of the wallpaper on a Windows desktop. Users can set their desktop wallpaper to be displayed (or not displayed) by using the Display icon in Control Panel. You can also use a policy setting to configure desktop wallpaper. To specify the desktop wallpaper that displays on users' desktops, administrators can use the Active Desktop Wallpaper policy setting (found in the Group Policy Object Editor, under the User Configuration\Administrative Templates\Desktop\Active Desktop. As a result, the user can choose to display or not display the wallpaper, but the administrator can choose which wallpaper is displayed when the display setting is ON.
More here:
http://technet.microsoft.com/en-us/library/cc727969.aspx
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