I was about to add a reference to the win32s thunking, and then chanced upon this [0] MSDN article that talks about supporting 32 bit I/O in 64 bit drivers. [0]

I was about to add a reference to the win32s thunking, and then chanced upon this [0] MSDN article that talks about supporting 32 bit I/O in 64 bit drivers. [0] https://msdn.microsoft.com/en-us/library/windows/hardware/ff565689(v=vs.85).aspx https://msdn.microsoft.com/en-us/library/windows/hardware/ff...