Microsoft is working to fix a weird Open With bug in Windows 10 caused by KB5036979 update
If you uninstalled the recently released KB5036979 update for Windows 10, you may have experienced unwanted Open With dialogs appearing. While first spotted in Outlook for Windows, Snip & Sketch, and Teams, the problem affects other apps as well.
While there is not yet a fix for this irritating, semi-random pop up, Microsoft has acknowledged the issue. The company is working on a patch for the bug, and offers up some insight and advice in the meantime.