When a user clicked "Invite to Game" or "Join Session" from the Xbox guide, dashboard, or a PC notification, the system would launch a URL like:
For a user today trying to play Gears of War 1 (GFWL) or Halo 3 (Xbox 360 system link over internet) : ms-xbl-multiplayer link fix
Before we fix the problem, we must understand what it is. The term "ms-xbl-multiplayer" is a URI scheme (Uniform Resource Identifier) used by Microsoft. It functions similarly to how a website uses "http://" or an email client uses "mailto://". When a user clicked "Invite to Game" or
Do not jump straight into registry edits. Try these quick fixes: or a PC notification