While v1.4.140 is an older build (current versions have moved past 2.0), the 1.4 series introduced several foundational improvements:
The file refers to a specific build of Wallpaper Engine , a popular Windows application that enables the use of live, interactive, and animated wallpapers. What is Wallpaper Engine? Wallpaper.Engine.v1.4.140.rar
Tools for adjusting playback speed, colors, and orientation of individual wallpapers. While v1