typedef struct _GUID                                                            // 4 / 4 elements; 0x0010 / 0x0010 Bytes
{
    ULONG32                     Data1;                                          // 0x0000 / 0x0000; 0x0004 / 0x0004 Bytes
    UINT16                      Data2;                                          // 0x0004 / 0x0004; 0x0002 / 0x0002 Bytes
    UINT16                      Data3;                                          // 0x0006 / 0x0006; 0x0002 / 0x0002 Bytes
    UINT8                       Data4[8];                                       // 0x0008 / 0x0008; 0x0008 / 0x0008 Bytes
} GUID, * PGUID;

Return to OS-specific structures/unions/enums list.
Return to OS version list.