The file I'm using is the default one 3DPublishOut.dwf. I also tried custom files.
Windows 7 x64. I've downloaded DWFToolkit-7.7-bin-win32.zip and used Visual Studion 2008 to build the sample.
BTW, when I open the sample project I get a bunch of errors of loading projects DWF Core Library, DWFToolkit etc. Thus those projects are marked with grey color. Nevertheless the sample builds fine. Just crashes.