It's a front version. It is the software submitted by the software manufacturer to the 360 Security Center on its own initiative, and released after being reviewed by the staff. When these softwares are updated, 360 users can update to the latest version as soon as possible.
Yes On the 360 software, the downloaded steam belongs to normal application software and can be started to play. Steam platform is a game and software platform developed and designed by Bram Cohen, a BitTorrent(BT) developer hired by Valve Company.