C# Definition:

[StructLayout(LayoutKind.Explicit)]
public struct RAPIINIT
{
    [FieldOffset(0)] public int cbsize;
    [FieldOffset(4)] public System.IntPtr heRapiInit;
    [FieldOffset(8)] public System.IntPtr hrRapiInit;
};

VB Definition:

Structure RAPIINIT
   Public TODO
End Structure

User-Defined Field Types:

None.

Notes:

This structure is 32-bit specific due to its use of explicit layout. Is that really necessary?