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stuff that runs in chrome? that's not really a desktop app.

Well, Chromium is FOSS so you can distribute it with your application if that need arises.

He specifically wrote that he looks for platform native and desktop app.

I don't think Chrome fulfilling anything here, and Chrome is not FOSS. Chromium is. But then again, that's not what he's requesting at all.

And Windows 8.

Windows 8 HTML5 apps are designed completely differently from on-the-Web HTML5 apps and Native Client apps.

the carryover is significant but you don't get a Windows 8 port for free.

Well, event for web apps you have to make sure all the browser work as expected...