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I'm trying to change Windows 8.1 (desktop) lock screen image from WPF application.

I've found solution with Windows SDK approach, but it uses runtime application as example (actually, all information I've found was regarding to WinRT apps). But I don't want to use WinRT - all I want is to use LockScreen class in plain old WPF.

After all I have managed to do this in the WPF app several times. This included:

1) manually adding <TargetPlatformVersion/>8.1</TargetPlatformVersion> into .csproj as suggested here;

2) adding references to Windows and System.Runtime.WindowsRuntime as suggested ibid;

3) following these steps to change lock screen background

Then I've faced the problem with platform - application does what it should only with x64 platform (not anyCPU). And not each time (I could not determine consistency yet).

Any way I think that I am over-complicating the solution. Does anyone have other suggestions? Is there any other simpler/cleaner way to change Windows 8.1 lock screen image via WPF application?

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Illia Ratkevych
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