Resolution:
The need of the .NET module comes from a limitation of the C# language that does not allow the use of Cdecl calling convention for callbacks.  

This is a C# limitation and not a .NET limitation as the CLR allows that.  To solve this problem we provide the callback signatures in a separate module that contains callback definitions with Cdecl calling convention.  It has to be a separate module since the .NET Disassembler contains a defect (reported to Microsoft) in the reassembled code.  As .NET is not able to merge codes from different languages we have to provide two parts for our distribution: the main DLL and the .NET module.  .NET module is part of .NET, and even supported by the C# compiler.

These are just not supported by Microsoft Visual Studio .NET.  Once Microsoft supports this feature in Visual Studio we can modify it.