Accessing Fortran in Visual Basic

[ralf]

Hi,
what am I missing, or what am I doing wrong with my project? I take this trivial code

function VBTest ()
implicit none
CHARACTER*100, dll_export:: VBTest
VBTest = 'foobar'
end function VBTest

in Lahey 7.1 compiler within Visual Studio 2003. command line addition is

-win -dll -ml msvb

Now when I try to add the dll in another Visual Studio 2008 Visual Basic project as a reference, a message arises which claims that this dll is no valid assembly or COM component. What am I doing wrong? Are there other ways to use this Fortran dll?

Thanks in advance.