In the 1909 system, you may encounter errors reported by the Security Center. When you open the Windows Security Center, the message "Need to use a new application to open this windows defender link." This indicates that the Windows security application is damaged, so the link is not working properly. Of course, there is no application in the Microsoft Store that can handle this application. If you are also a victim of this issue, please try the suggestions mentioned below and see if they help.
1. Right-click Start Button or press Win + X keys and select Windows PowerShell (Admin).
2. In administrative Windows PowerShell window, type/paste following and press Enter key:
The first sentence: $BasePath = Get-Content .\appx.list (don’t care about errors)
Second sentence: $BasePath |% {$Path = $($_).Trim() Add-AppxPackage -Register -DisableDevelopmentMode "$Path\AppXManifest.xml"}
The third sentence: Get-AppxPackage | Select InstallLocation | Out-file appx.list
Fourth sentence: Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
Press the "enter" button for each sentence
Execute the code, and you will see the deployment progress. Once the execution is complete, you can close Windows PowerShell. Now try to open Windows Security / Defender. This time it should work normally.