WIN64 ULONG_PTR vs ULONG

[pylabdev]

Hello:

in MAPIX interface, there are many functions using ULONG_PTR like PrepareForm or so.
When I trace the original mapix.h in the Win7 SDK, it is using ULONG for the argument like ulUIParam
In Win64 ULONG_PTR is int64, ULONG is still 32bit int.
In Win64, ULONG* is the same as ULONG_PTR or ULONG_PTR*, all are 64bit.

This sounds a conflict.
Is the Outlook using the mapistub interface declaration?
This makes the interface not compatible with old header files.
How can we find the real interface layout from the Outlook DLL directly?
This will make the function signature not compatible

MAPIMETHOD(PrepareForm)(THIS_                                       
    /*in*/  ULONG_PTR ulUIParam,                                    
    /*in*/  ULONG ulFlags,                                          
    /*in*/  LPMAPIFORMINFO pfrminfo) IPURE;                         

Thanks for the help