"You'll need a new app to open this windowsdefender link" fix

Anonymous
2022-02-09T15:04:00+00:00

Hi this post is to help people with windows 10 and 11 windows security not working

On windows 11 do this

  1. launch powershell as an admin
  2. Set-ExecutionPolicy Unrestricted
  3. Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
  4. Set-ExecutionPolicy restricted

IGNORE THE ERRORS

on windows 10 do this

  1. launch powershell as an admin}
  2. run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
  3. if it doesn't work do this
    4) run Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"
  4. run get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
Windows for home | Windows 11 | Performance and system failures

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  1. Anonymous
    2022-09-24T08:17:12+00:00

    Tried all of these, also no joy!!! Brand new Win11 install from uupdump iso ... Win11 22H2 25206.1000 build!

    Looks like i am going to have to go down the recently released official 22H2 ISO that went GA, and change channels after....

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  2. Anonymous
    2022-11-07T12:03:39+00:00

    Hello, i have something to add

    "4) Set-ExecutionPolicy restricted"

    afaik, the execution policy setting is only for this powershell session. So this is not needed i guess?

    also, for me the problem was fixed after endpoint protection update and reboot.

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  4. Anonymous
    2023-02-08T06:02:19+00:00

    Thanks for your help

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  5. Anonymous
    2023-03-01T15:45:05+00:00

    Still looking for answers? I was too. None of the Powershell fixes worked for me.

    I finally found my fix here: https://www.winhelponline.com/blog/need-new-app-open-windows-defender-link/#download

    The downloads listed are not hosted by Microsoft but they are properly signed my Microsoft and scanned clean for me.

    Basically I had to redownload and reinstall both Microsoft.UI.Xaml (Microsoft.SecHealthUI_8wekyb3d8bbwe.appx) and Microsoft.SecHealthUI (Microsoft.UI.Xaml.2.4_2.42007.9001.0_x64__8wekyb3d8bbwe.appx)... afterward the Security app opened as it should.

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    8 people found this answer helpful.
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