Min version	Vista	8 Pre RTM	8 Pre RTM	8.1 Update 1
Max version	7 SP1		8.1 Update 1	10 TH2
x86 offset offset:bitpos	Field Name
0x0000	struct _HEAP_LOCAL_SEGMENT_INFO * LocalInfo
0x0004	volatile struct _HEAP_USERDATA_HEADER * UserBlocks		struct _HEAP_USERDATA_HEADER * UserBlocks
0x0008	struct _INTERLOCK_SEQ AggregateExchg	union _SLIST_HEADER DelayFreeList
0x0010	uint16_t BlockSize	volatile struct _INTERLOCK_SEQ AggregateExchg
0x0010	unsigned long[2] Alignment
0x0012	uint16_t Flags
0x0014	uint16_t BlockCount	uint16_t BlockSize	volatile uint16_t BlockSize
0x0014		unsigned long[2] Alignment
0x0016	uint8_t SizeIndex	uint16_t Flags
0x0017	uint8_t AffinityIndex
0x0018	struct _SINGLE_LIST_ENTRY SFreeListEntry	uint16_t BlockCount
0x001A		uint8_t SizeIndex
0x001B		uint8_t AffinityIndex
0x001C	volatile unsigned long Lock	struct _SINGLE_LIST_ENTRY SFreeListEntry		volatile unsigned long Lock
0x0020		volatile unsigned long Lock		struct _SINGLE_LIST_ENTRY SFreeListEntry