A new setting has been discovered in the developer version of Windows 11 (build 26×20.6690) that allows users to set video files, such as .mp4, as their desktop background. This feature, called Windows DreamScene, originally debuted in Windows Vista Ultimate in 2007, enabling users to personalize their desktops with moving wallpapers. DreamScene was not widely recognized at the time due to its limited availability and general disinterest in animated wallpapers.