Manually build WP7 solution with MSBuild on win64

When manually building a WP7 solution file on a win64 machine make sure you use the correct version of msbuild.exe - if you don't you'll get the loads of 'failed to load assembly' messages.

The message that gives it away is 'Could not load file or assembly PresentationCore':

C:\Program Files (x86)\MSBuild\Microsoft\Silverlight for Phone\v4.0\Microsoft.Silverlight.Common.targets(188,9): error MSB4018: S
ystem.IO.FileLoadException: Could not load file or assembly 'PresentationCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=3
1bf3856ad364e35' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047
)\r [C:\Work\Temp\PhoneApp2\PhoneApp2\PhoneApp2.csproj]

So get it to build you have to use the msbuild.exe from the standard .net directory - C:\Windows\Microsoft.NET\Framework\v4.0.30319.

So the following will fail:

And the following will succeed:

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