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Steam no longer supports Windows 7, 8, and 8.1
(www.neowin.net)
This is a most excellent place for technology news and articles.
I've used Steam since before Chrome was a thing. So you happen to know what they uses before? Internet Explorer?
Also, I wouldn't blame Google as much as I would blame Microsoft. When Microsoft themselves aren't supporting the OS, why should anyone else (like Google or Valve)?