You can edit the file:
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V110\Platforms\ARM\Microsoft.Cpp.ARM.Common.props
In the <PropertyGroup>
section add the line:
<WindowsSDKDesktopARMSupport>true</WindowsSDKDesktopARMSupport>
before </PropertyGroup>
And that’s all, you can build ARM desktop apps with VS2012.