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I have figured out how to change the desktop wallpaper (there are dozens of examples on the Internet.)
One thing that still eludes me: how do I detect when the wallpaper has changed? (Say via the Display control panel or another program changing it.)
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Under Local Computer Policy, expand User Configuration, expand Administrative Templates, expand Desktop, and then click Active Desktop. Double-click Active Desktop Wallpaper. On the Setting tab, click Enabled, type the path to the desktop wallpaper that you want to use, and then click OK.
To set a different wallpaper on Windows 11 without activation, use these steps: Open Photos. Open the image to set it on the desktop. Right-click the image, select the Set as, and choose the Background option.
Add a message handler for WM_SETTINGCHANGE, SystemEvents.UserPreferenceChanged in .NET. Check if the wallpaper is still the same.
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