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Do not use restricted XNA APIs (e.g. MediaLibrary) to allow use in background agent on Windows Phone
The "Marketplace test kit" in Visual Studio fails when referencing the library in the background agent or one of its referenced assemblies
[ERROR] : Unsupported API cannot be used by a background agent. Assembly WriteableBitmapExWinPhone.dll was trying to use Microsoft.Xna.Framework.Media.MediaLibrary::.ctor.
Split the features requiring access to the MediaLibrary in a separate DLL.