On my website I am doing a review the Xbox-games app on Windows 8.1. And for some reason I don't get it why it should be there? Is there anything extra to your gaming-experience while playing with the Games-app installed? The only reason I can think of is for your messages and progress, but this is also available on xbox.com.
Is there any reason why I must install this app?
11 Answer
Windows 8 includes a new Games app that lets you review your Xbox Live game activity and friends and browse games and content for both your Xbox 360 console and PC. Source
Back in June I went to a Microsoft training that laid out some of the future plans with Windows. The Xbox Games app does essentially what you've surmised; it allows you to connect to your friends, view messages, view games, and write reviews. It is extending the functionality of your Xbox Live to PC based games. This allows your friends to view achievements for those games.
Microsoft also has an initiative to bring more arcade style titles into the Windows experience, which works very well for developers looking to go cross-platform.
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