Question

I want to know whether Metro Applications developed using Visual Studio 11 Developer Preview and .Net FrameWork 4.5 can run in Windows 7 or XP.

Not the normal Windows Form or WPF, I want to know about the all new Metro Apps.

What new things needed to run Metro Apps in Windows XP or Windows 7

Answer 1

What new things needed to run Metro Apps in Windows XP or Windows 7

A virtual machine of Windows 8. Metro apps currently don’t run on Windows 7, and definitely don’t on Windows XP. According to this thread, it’s difficult but might happen eventually:

Keep your eyes out on future Channel 9 videos and on the BCL/CLR blog
for more information around the challeges of enabling the Portable
Library story, however, I will give a quick summary with regards to
ViewModels:

While the ViewModels themselves are defined by the
application, they often take dependencies on types (ie
INotifyXXXChanged interfaces, ICommand, etc) that live inside the
framework. Currently if you look across our multiple .NET platforms
(Silverlight, Phone, .NET and now Metro style apps), these all live in
different assemblies, and with Metro apps, a different
namespace/technology (WinRT). This makes it challeging to give the
user a surface area that can compile against and still have it run on
all these other platforms. We’ve got some ideas on how we’re going to
enable this, however, it requires some work and doesn’t come for free.

In saying that, however, we completely see the value and
really, really want to do this.
David

But it’s not currently possible. At best, you could just make a desktop app version of the same thing.