Min version	Vista	Vista SP1	7		7 SP1		8 Pre RTM		8 Pre RTM	8	8.1 Update 1	8.1	8.1 Update 1
Max version	Vista SP2		7 SP1						8			8.1 Update 1	10 TH2
Architecture	x86	x64	x86	x64	x86	x64	x86	x64	x86	x64	x86	x64	x86	x64
x86 offset offset:bitpos	Field Name														x64 offset offset:bitpos
0x0000	struct _RTL_CRITICAL_SECTION Lock	struct _RTL_CRITICAL_SECTION Lock	struct _RTL_CRITICAL_SECTION Lock	struct _RTL_CRITICAL_SECTION Lock	struct _RTL_SRWLOCK Lock		struct _RTL_SRWLOCK Lock								0x0000
0x0000					struct _RTL_CRITICAL_SECTION padding	struct _RTL_CRITICAL_SECTION padding									0x0000
0x0004							struct _LIST_ENTRY SubSegmentZones								0x0008
0x000C							void * Heap								0x0018
0x0010							void * NextSegmentInfoArrayAddress								0x0020
0x0014							void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	void * FirstUncommittedAddress	0x0028
0x0018	struct _LIST_ENTRY SubSegmentZones	struct _LIST_ENTRY SubSegmentZones	struct _LIST_ENTRY SubSegmentZones	struct _LIST_ENTRY SubSegmentZones	struct _LIST_ENTRY SubSegmentZones	struct _LIST_ENTRY SubSegmentZones									0x0028
0x0018							void * ReservedAddressLimit								0x0030
0x001C							unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	unsigned long SegmentCreate	0x0038
0x0020	uintptr_t ZoneBlockSize														0x0038
0x0020							unsigned long SegmentDelete								0x003C
0x0024	void * Heap	void * Heap	void * Heap	void * Heap	void * Heap	void * Heap	volatile unsigned long MinimumCacheDepth								0x0040
0x0028							volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	volatile unsigned long CacheShiftThreshold	0x0044
0x0028	unsigned long SegmentChange	unsigned long SegmentChange	unsigned long SegmentChange	unsigned long SegmentChange	unsigned long SegmentChange	unsigned long SegmentChange									0x0048
0x002C							unsigned long SizeInCache	uint64_t SizeInCache	unsigned long SizeInCache	uint64_t SizeInCache	volatile unsigned long SizeInCache	volatile uint64_t SizeInCache	volatile unsigned long SizeInCache	volatile uint64_t SizeInCache	0x0048
0x002C	unsigned long SegmentCreate														0x004C
0x0030	unsigned long SegmentInsertInFree						union _HEAP_BUCKET_RUN_INFO RunInfo		volatile union _HEAP_BUCKET_RUN_INFO RunInfo						0x0050
0x0034	unsigned long SegmentDelete														0x0054
0x0038	unsigned long CacheAllocs	unsigned long CacheAllocs	unsigned long CacheAllocs	unsigned long CacheAllocs	unsigned long CacheAllocs	unsigned long CacheAllocs									0x0058
0x0038							struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache	0x0060
0x003C	unsigned long CacheFrees														0x005C
0x0040	struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache		uintptr_t SizeInCache												0x0060
0x0048			union _HEAP_BUCKET_RUN_INFO RunInfo												0x0068
0x0050			struct _USER_MEMORY_CACHE_ENTRY[12] UserBlockCache												0x0070
0x0100	struct _HEAP_BUCKET[128] Buckets														0x01E0
0x0110			struct _HEAP_BUCKET[128] Buckets												0x01F0
0x01B8							struct _HEAP_BUCKET[129] Buckets						struct _HEAP_LFH_MEM_POLICIES MemoryPolicies		0x02A0
0x01BC													struct _HEAP_BUCKET[129] Buckets	struct _HEAP_BUCKET[129] Buckets	0x02A4
0x0300	struct _HEAP_LOCAL_DATA[1] LocalData														0x03E0
0x0310			struct _HEAP_LOCAL_DATA[1] LocalData												0x03F0
0x03BC							struct _HEAP_LOCAL_SEGMENT_INFO *[129] SegmentInfoArrays								0x04A8
0x03C0													struct _HEAP_LOCAL_SEGMENT_INFO *[129] SegmentInfoArrays	struct _HEAP_LOCAL_SEGMENT_INFO *[129] SegmentInfoArrays	0x04A8
0x05C0							struct _HEAP_LOCAL_SEGMENT_INFO *[129] AffinitizedInfoArrays								0x08B0
0x05C4													struct _HEAP_LOCAL_SEGMENT_INFO *[129] AffinitizedInfoArrays	struct _HEAP_LOCAL_SEGMENT_INFO *[129] AffinitizedInfoArrays	0x08B0
0x07C4											struct _SEGMENT_HEAP * SegmentAllocator	struct _SEGMENT_HEAP * SegmentAllocator			0x0CB8
0x07C8													struct _SEGMENT_HEAP * SegmentAllocator	struct _SEGMENT_HEAP * SegmentAllocator	0x0CB8
0x07C8							struct _HEAP_LOCAL_DATA[1] LocalData								0x0CC0
0x07D0													struct _HEAP_LOCAL_DATA[1] LocalData		0x0CC0