ieblog: Developer Guidance for Web Sites with Flash Content in Windows 8
“On Windows 8, Internet Explorer 10 on the desktop and Metro style IE use the same integrated Adobe Flash Player with no need to download or install an additional player.”
Windows 8 will include Flash in both Desktop IE (plugin) mode and Metro IE (html5) version. Developers may add a preference for IE mode and the browser will pass this suggestion on to the user.
