>I have never needed do modify the .def file manually. I just declare the functions extern "C" and __declspec(dllexport). So, I can use the dll from C/C++ (statically or dynamically) and VFP. What am I missing here?

Well, I've never gotten it to work without it. Also the DLL Wizards
create the DEF file by default, so...

I think it may have to do with the WINAPI macro I use. WINAPI allows
for importing and exporting depending on how you use the lib file,
so maybe it needs the explicit pointers to the export functions.