DesktopSlides: Desktop Wallpaper Changer For Windows XP/Vista
Windows 7 users have a built-in feature which can run a slideshow of desktop backgrounds with a customizable frequency. Windows Vista and Windows XP users need not get disappointed. Here is a free tool, DesktopSlides which lets you change wallpaper automatically after a specified number of minutes.
DesktopSlides lets you load a set of wallpapers present in a folder. You can then filter them by display/screen ratio, shuffle them and position them (tile, stretch, fit to screen). This multithreaded wallpaper changer application takes advantage of multi core processors and supports 64 bit mode where available.

DesktopSlides works with Windows XP / Vista / 7 (32 / 64 bit) | .NET Framework 3.5
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