Is this possible? I have read on the www that it is not especially if in C++.

I think the DLL is somehow modifying p-code using C/C++. The DLL is references in a VBA/VB6 project and then produces profiling stats on each function call.

Thanks for any insight into this.

Otherwise any suggestions how I can go about building a tool like this.

Yes


Whoever said that was wrong.


Why build a new tool? If it really is VB P-code, use a VB P-code decompiler like http://www.vb-decompiler.org/. If it's native code, use Hex-Rays.