Convert C# to unmanaged C++

I have the unenviable task of converting a couple of C# (CCW) COM servers (one is an Activex Control) to unmanaged C++. Any suggestions on tools I could use to make this a开发者_JAVA百科s easy as possible would be gratefully accepted.

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Tangible Software sells a C# to C++ converter, but I've never used it myself...

http://www.tangiblesoftwaresolutions.com/Product_Details/CSharp_to_CPlusPlus_Converter_Details.html