Windows Store: Getting Started

Currently if you want to build a Windows Store App player, you have to do it on Windows 8, this may change in the future. On Windows Store platform we don't use Mono, we use Microsoft's .NET together with WinRT, because of this major change comparing to other Unity platforms some of the API may not yet work, but ~95% of API does work. Also because we use Microsoft .NET, this will also allow you to debug your scripts with Visual Studio.

Unity will support three Windows Store 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
Animation on script variables
AnimationEvent callback functions with arguments (you have to provide a function with no arguments or with AnimationEvent argument)
GameObject.SendMessage (partially works, but function which accepts the message must match the message sent, because the argument conversion doesn't work)
Fog doesn't work on devices with feature level < 9.3, you need to implement it manually, see http://files.unity3d.com/tomas/Metro/Examples/MyCustomFog.shader

Requirements when targeting Windows SDK 8.0:

Windows 8 (Note: Windows 8 N users please 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 please 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

Helpful links

Generic Windows Store Apps samples for Windows 8.0 http://code.msdn.microsoft.com/windowsapps/Windows-8-app-samples-4d76cbbf
Generic Windows Store Apps samples for Windows 8.1 http://code.msdn.microsoft.com/windowsapps/Windows-8-Modern-Style-App-Samples
Generic forum for Windows Store Apps http://social.msdn.microsoft.com/Forums/windowsapps/en-US/home?category=windowsapps