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The app WallpaperEngine can somehow set the Wallpaper to a HTML page, scene or video. I'm trying to do pretty much the same thing, so I looked and found this option in VLC to set a video as a wallpaper:

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But that just creates a window and not an actual wallpaper. You can see this in the Desktop switcher:

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The WallpaperEngine background (the purple one with the pink blob in the screenshot that you can see on Desktop 2 and 3 and in the background) behaves like a regular wallpaper (but animated). How do they achieve this? Is there some hidden API that allows setting a video stream as a wallpaper or do they just set the wallpaper to that every few milliseconds?

lxhom
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    What does "actually registered as a wallpaper" mean? How can you back up this claim? I bet they are using a window. – Anders Jun 20 '22 at 15:31
  • @Anders it looks and behaves like a wallpaper (changed the wording on that in the Q, "registered" is the wrong term there), anywhere you look for a wallpaper, for example the desktop switcher in the screenshot, it shows the wallpaper. The purple one on Desktop 1-3 is WallpaperEngine, that moves if I move my mouse. And they might use some kind of fullscreen window or something to achieve that, but that's what I'm trying to figure out lol – lxhom Jun 20 '22 at 15:44
  • Have you tried Spy++? Have you looked to see if dwm.exe has injected 3rd-party dlls? – Anders Jun 20 '22 at 15:59
  • System requirements on Steam: "Aero must be enabled on Windows 7." This might be a hint that it is DWM related. – Anders Jun 20 '22 at 16:13
  • https://help.wallpaperengine.io/en/performance/dwm.html# "... they are part of the Windows Explorer process." – Anders Jun 20 '22 at 16:17

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