[plt-scheme] Extensions in Visual Studio

I am trying to write extensions using Visual Studio, and haven't had
any luck doing that. :)

This is my def file:
LIBRARY   mzExtension
EXPORTS
   scheme_initialize
   scheme_reload
   scheme_module_name

My project is a DLL project and the source is the sample make adder
for 3m.

I link to mzdyn3m.obj and libmzsch3m_6ncc9u.lib

When trying to load the extension, mzscheme complains about not
finding the entry and tells me it's not an extension..

Anything I've missed?

I can create the extension using mzc, of course, but I want to use my
IDE.