reg.exe platform specific test?

[Jonathan Vollebregt]

In the reg.exe tests around line 181:
> verify_reg(hkey, "dword8", REG_DWORD, &dword, sizeof(dword),
>            (sizeof(long) > sizeof(DWORD)) ? 0 : TODO_REG_DATA);

What's the reason for this? Is there some platform specific quirk I 
should be aware of?