Getting Started

Currently if you want to build a Windows Store Apps player, you have to do it on Windows 8 or Windows 8.1 (Windows 8.1 is needed if you’re targeting SDK 8.1). On Windows Store Apps platform we don’t use Mono, we use Microsoft’s .NET together with WinRT. This allows you to debug your scripts with Visual Studio.

Unity supports three Windows Store Apps targets: X86, X64 and ARM.

The player log is located under <user>\AppData\Local\Packages\<productname>\TempState.

Things that are not yet supported:

Network classes, WWW is supported though
GameObject.SendMessage (partially works, but function which accepts the message must match the message sent, because the argument conversion doesn’t work)
You can’t access C# classes from JS scripts, you should be able to access JS classes from C#
Fog doesn’t work on devices with feature level < 9.3, you need to implement it manually, see Custom Fog Shader

Requirements when targeting Windows SDK 8.0:

Windows 8 (Note: Windows 8 N users should install this patch http://www.microsoft.com/en-us/download/details.aspx?id=30685)
Visual Studio 2012 (11.0.50727.1 or higher) or Visual Studio 2013 + Windows SDK 8.0 http://msdn.microsoft.com/en-us/library/windows/desktop/hh852363.aspx

Requirements when targeting Windows SDK 8.1:

Windows 8.1 (Note: Windows 8.1 N users should install this patch http://www.microsoft.com/en-us/download/details.aspx?id=40744)
Visual Studio 2013 (12.021005.1 or higher)

Before you can proceed you need to acquire Windows 8 developer license, this can be done in two following ways:

Build an empty Windows Store application from Visual Studio and deploy it, if you’re doing this first time, a dialog window for getting developer license should open, follow the steps.
See this link - http://msdn.microsoft.com/en-us/library/windows/apps/hh974578.aspx#getting_a_developer_license_by_using_visual_studio