My story is : A third party application is extensible using the Windows DLL
interface. It defines a well-formated import/export DLL interface to
commuicate with the extensions. The extension is required to implement all
these DLL interfaces to be able to plug into the application's framework.

I do understand VB.NET program can interop with other applications using the
.net framework and the meta-data stored in the executable. You can also
export the functionality using the COM interface. But is that possible to
export VB.BET application's functionalities using the native DLL? I mean,
export using the import/export tables in its PE header.

I have one possible solution:
Maybe using a mixed managed/unmanaged Visual C++ DLL can do it. The
unmanaged part communicates with the third party app, the managed part
communicates with my VB.NET program.

But is there any easier way to do it?

David