I'm not able to quote but what Alex Smith said above is correct.
I got a false positive with the Windows Feedback App (I don't care actually, it will get replaced). What I know is sfc /scannow or dism will NOT fix it. I will wait for the next upgrade.
The authorities on this folder include ALL APPLICATION PACKAGES which is a new SID since Windows 8. (Perhaps 8.1 I can't remember). It also excludes local users including Administrators and if you decide to take ownership and grant yourself authority you could end up messing up every other app as they are a bit fussy about authority.
I really think if you get a false positive with a Windows App you should report it and then restore back. If you play with permissions to replace the object you will only make it all worse.
The other option is to disable MBAR and do an in-place upgrade. That definitely fixes it as it replaces all of your default apps in that folder.