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Following the April 2018 Windows 10 update, is the Windows protected your PC SmartScreen warning dialog missing?

Windows protected your PC

I have a small free app that uses ClickOnce for install/distribution, and it's always been plagued by this dialog after install.

Doing some work today, I found that the dialog was no longer showing and instead my app was silently closing after startup.

After some head scratching I went into Windows Defender and changed the App & browser control setting from Warn to Off.

Windows Defender

...and my app now starts up.

I tested this on two PCs, both of which have the April 2018 update installed, and found the same results.

This seems more like a bug than an intentional change since it essentially breaks apps that fail the Windows SmartScreen check. Can anyone comment?

Richard Ev
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1 Answers1

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There is a TechNet thread, which handles this issue:

Microsoft has confirmed this is a known issue:

According to our product team collection information and test, we can now confirm this is an known issue. And We are working on fixing it.

Karen_Hu - Microsoft Contingent Staff

Smartscreen prompt does not show for ClickOnce app since Windows 10 Update 1803