Debugging a VC++ 6.0 DLL called from a VB.NET .exe file

I have a program written in vb6 which uses routines in a dll written by me in vc++ 6.0. I can trace through the dll line by line by using Ctr F10 etc - perfect, no problem

Now, I am converting the vb6 stuff to vb.net and am well along. I have not yet moved from vc++ 6.0 to vc++.net but will probably do so in due course.

I had hoped that I could trace through the vc++ 6.0 dll when using the debug version written in vb.net but it says ".exe does not contain debugging information". But there is a pdb file generated by the vb.net compiler in the same folder as the exe file.

So, is this possible? If so, any ideas of what to do to enable debugging?

Thanks in anticipation