winforms - How can I add a specific version of System.XML (2.0.5.0) to my .Net 4 project -

I am making map editor for just one standard .NET 4 WinForms project for my Windows 7 Phone Game.

I have already written XmlSerialise / Desearilise methods - they live in Load and Save methods in an Entity Calligraphy class within the phone project.

Windows 7 uses the 2.0.5.0 version of the phone system. Xml, System.Xml.Linq and System.Xml.Serialization.

I copied these DLs into a Libs Directory and tried to refer them to my Net4 project - Refers to System.Xml.Serialzation 2.0.5.0 As I was hoping, but I want to ask System.Xml dll - when I refer to it from my Libs directory, it ignores me only 4 references.

Anyway I can force it to refer to 2.0.5.0 a?

Thanks,

Andy

Maybe here's the option Only between projects (win form and WP7) will be to share the file, unless the compiler complains