PInvoke question (caling conventions of C DLLs)

I want to call functions in a Win32 DLL from VB. The DLL in question, is the Python DLL (python25.dll).

I have noticed something strange. When I declare the functions in VB6 (i.e. VB classic), I get an error : "Bad DLL calling convention" - yet when I run the same code through VB.Net, the code works fine - my assumption is that VB.Net can make calls to C functions using either the __stdcall OR __cdecl, whereas VB6 requires the __stdcall calling convention.

This is just a hunch - does anyone know the technical reason for this behaviour?
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