Windows-7-Logon-Background-Changer

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http://www.softpedia.com/get/Tweak/System-Tweak/Windows-7-Logon-Background-Changer.shtml

Windows 7 Logon Background Changer description


Change the wallpaper of the Windows 7 login screen
The Windows 7 Logon Background Changer application was designed to be a free open source software that lets you change the wallpaper of the Windows 7 login screen. It has been tested successfully with Windows 7 RC 7100, but it should also work with future releases.

What does it do?
- It does NOT change any system file, and the program itself does not requires admin rights to run (it will just ask you to run as admin a very simple cmd file that creates the required folder et registry key with the appropriate rights)
- It creates a few JPEG files based on the image you want to put as wallpaper for the Windows 7 login screen, applies the appropriate cropping and sizing and saves them using the best compression quality possible.