SDK CVI compiler Warnings 64-bit

Question

It seems I am finding CVI Compiler warnings when compiling 64 Bit applications with SDK. I don't get these warning errors when I compile the same applications for 32 Bit.
For example the CVI Compiler warning that I just found was found when I used SDK header file: "SetupAPI.h" with the typedef struct: SP_DEVINFO_DATA and SP_DEVICE_INTERFACE_DATA.
The warning message I got was when I compiled the statements with the SetupAPI.h file included:
SP_DEVINFO_DATA DeviceInfoData;
/* warning message */
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
// Warning: Conversion from 'unsigned __int64' to 'DWORD' might lose data.
/*warning message*/
SP_DEVICE_INTERFACE_DATA did = {sizeof(did)};
// Warning: Conversion from 'unsigned __int64' to 'DWORD' might lose data.
When I compile these statements in 32-Bit I don't get these errors.
Of course I can change the "SetupAPI.H" SDK Header supplied by NI but that defeats the whole purpose of why NI would distribute the header file in the first place.

Answer 1

OK - Milan -
I think you misunderstood what I was writing about.
If you look at the SetupAPI.h file that is supplied by NI SDK with CVI 2010 at line 700 with the following typedef  struct:
// Device information structure (references a device instance
// that is a member of a device information set)
typedef struct _SP_DEVINFO_DATA {
    DWORD cbSize;
    GUID  ClassGuid;
    DWORD DevInst;    // DEVINST handle
    ULONG_PTR Reserved;
} SP_DEVINFO_DATA, *PSP_DEVINFO_DATA;
The DWORD is defined as
"typedef unsigned long"
 in cvidef.h (CVI 2010) header file.
Yes I could change the SetupAPI.h inside the header file to change the type to be __int64 instead so that it works with 64 Bit. However, if other applications that are written for 32 bit will now be impacted if the SetupAPI.h is used with the __int64 data type DWORD.
So what NI should so everywhere where they define "DWORD" that is used in the SDK they should have a conditional compile to set the type to "typedef __int64" in CVI 64-bit applications and
"typedef unsigned long" in 32 Bit Applications.