If You'll need a new app to open this windowsdefender link message appears every time you open Windows Defender, see this post.

To fix the Get an app to open this ‘ms-gamebar’ link error in Windows 11 follow these solutions. Fix this Game Bar issue by repairing the app.

Microsoft's Windows Defender antivirus has a new job, heading up Windows Defender Security Center and uniting all the OS safety features in one convenient location.