The keyword refers to a specific protocol handler used by the Xbox Game Bar in Windows 10 and 11 . Most users encounter this as a frustrating error message—"You'll need a new app to open this ms-gamingoverlay"—when launching games or pressing specific keyboard shortcuts.
This is a developer or system-level command intended for internal use by Windows to manage the state of the Xbox Game Bar. It is often referenced in system logs or troubleshooting guides when the Game Bar fails to open.

