I am trying to get SWIG to work with Visual Studio and C#.
I downloaded swigwin-2.0.4.zip and converted the project to a VS 2010 project.
I am able to build
The solution for me was
where file.exe is the executable produced by building the code.
For more information on what is going on Í found the following links helpful
http://www.davesquared.net/2008/12/systembadimageformatexception-on-64-bit.html
http://blogs.msdn.com/b/joshwil/archive/2005/05/06/415191.aspx