Calling main() from WinMain()

[BLM768]

I'm working on a cross-platform GUI library and I'd like to be 
able to call the user's main() function from WinMain() so users 
don't have to write both functions. However, I'm at a bit of a 
loss as to how to accomplish that. I know that D internally 
creates the extern(C) main(), which in turn calls D's main(), but 
I think that the C main() also performs some runtime 
initialization, which means that I probably shouldn't be calling 
it after WinMain() has already started. Since the D main() is 
defined at module scope, I'm not sure how to access it without 
importing one of the user's modules. I think that each module can 
define its own main() as well, which really complicates things. 
Is there a reasonably simple way to get the right main() function?

I hate to say it, but this is a problem that would actually be 
easier in C++ :)