SYSKIND
enum SYSKIND
Identifies the target operating system platform.
SYS_MAC = 2
The target operating system for the type library is Apple Macintosh. By default, all data members are aligned on even-byte boundaries.
SYS_WIN16 = 0
The target operating system for the type library is 16-bit Windows. By default, data members are packed.
SYS_WIN32 = 1
The target operating system for the type library is 32-bit Windows. By default, data members are naturally aligned (for example, 2-byte integers are aligned on even-byte boundaries; 4-byte integers are aligned on quad-word boundaries, and so on).
SYS_WIN64 = 3
The target operating system for the type library is 64-bit Windows.