Modern apps are blocked by security software when you start the applications on Windows 10

This article provides a workaround for an issue where modern apps are blocked by security software when you start the applications on Windows 10.

Original product version:   Windows 10, version 1903, Windows 10, version 1809, Windows 10, version 1607
Original KB number:   4016973

Symptoms

When you start a Modern app, such as Microsoft.MSN.Money.exe or Microsoft.Photos.exe, on Windows 10, version 1607, Windows 10, version 1809 or Windows 10, version 1903, you notice that the application is blocked by your security software.

Cause

This issue occurs because the individual files within an application package are not digitally signed even though the packages are catalog-signed.

Workaround

To work around this issue, add the affected applications to the allow lists of your security software.