Read VTK files

I am wondering if anyone has successfully added 64bit .net vtk assemblies or maybe suggest a way to get my hands on working ones. The ones I tried are 

http://vtkdotnet.sourceforge.net/ - which appear to be 32bit
http://sourceforge.net/projects/scape3d/files/3DScape/vtk%20library... which should be 64 bit

in both cases I get 

Could not load file or assembly 'file:///C:\Users\USER\Desktop\vtkCysW64DLL\vtkIO.dll' or one of its dependencies. The module was expected to contain an assembly manifest.

Or maybe I'm doing the whole thing wrong in general.

Thanks!