Min version	XP	2003/XP64 SP1	2003/XP64 SP1	Vista	Vista SP1	7		8 Pre RTM		8 Pre RTM	8	10 Pre RTM
Max version	2003/XP64 SP2		2003/XP64 SP2	Vista SP2		7 SP1				8.1 Update 1	10 Pre RTM	10 TH2
Architecture	x86	x64	x86	x86	x64	x86	x64	x86	x64	x86	x64	x86	x64
x86 offset offset:bitpos	Field Name													x64 offset offset:bitpos
0x0000	struct _HEAP_ENTRY Entry											struct _HEAP_SEGMENT Segment		0x0000
0x0000												struct _HEAP_ENTRY Entry		0x0000
0x0008	unsigned long Signature			unsigned long SegmentSignature										0x0010
0x000C	unsigned long Flags			unsigned long SegmentFlags										0x0014
0x0010	unsigned long ForceFlags			struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	struct _LIST_ENTRY SegmentListEntry	0x0018
0x0014	unsigned long VirtualMemoryThreshold													0x001C
0x0018	uintptr_t SegmentReserve	uintptr_t SegmentReserve	uintptr_t SegmentReserve											0x0020
0x0018				struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	struct _HEAP * Heap	0x0028
0x001C	uintptr_t SegmentCommit	uintptr_t SegmentCommit												0x0028
0x001C			unsigned long SegmentCommit	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	void * BaseAddress	0x0030
0x0020	uintptr_t DeCommitFreeBlockThreshold	uintptr_t DeCommitFreeBlockThreshold												0x0030
0x0020			unsigned long DeCommitFreeBlockThreshold	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	unsigned long NumberOfPages	0x0038
0x0024	uintptr_t DeCommitTotalFreeThreshold	uintptr_t DeCommitTotalFreeThreshold												0x0038
0x0024			unsigned long DeCommitTotalFreeThreshold	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	struct _HEAP_ENTRY * FirstEntry	0x0040
0x0028	uintptr_t TotalFreeSize	uintptr_t TotalFreeSize												0x0040
0x0028			unsigned long TotalFreeSize	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	0x0048
0x002C	uintptr_t MaximumAllocationSize	uintptr_t MaximumAllocationSize	uintptr_t MaximumAllocationSize											0x0048
0x002C				unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	0x0050
0x0030	uint16_t ProcessHeapsListIndex	uint16_t ProcessHeapsListIndex												0x0050
0x0030			uint16_t ProcessHeapsListIndex	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges	0x0054
0x0032	uint16_t HeaderValidateLength													0x0052
0x0034	void * HeaderValidateCopy			uint16_t SegmentAllocatorBackTraceIndex										0x0058
0x0036				uint16_t Reserved										0x005A
0x0038	uint16_t NextAvailableTagIndex			struct _LIST_ENTRY UCRSegmentList										0x0060
0x003A	uint16_t MaximumTagIndex													0x0062
0x003C	struct _HEAP_TAG_ENTRY * TagEntries													0x0068
0x0040	struct _HEAP_UCR_SEGMENT * UCRSegments	struct _HEAP_UCR_SEGMENT * UCRSegments	struct _HEAP_UCR_SEGMENT * UCRSegments	unsigned long Flags										0x0070
0x0044				unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	unsigned long ForceFlags	0x0074
0x0044	struct _HEAP_UNCOMMMTTED_RANGE * UnusedUnCommittedRanges	struct _HEAP_UNCOMMMTTED_RANGE * UnusedUnCommittedRanges	struct _HEAP_UNCOMMMTTED_RANGE * UnusedUnCommittedRanges											0x0078
0x0048				unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	unsigned long CompatibilityFlags	0x0078
0x0048	uintptr_t AlignRound													0x0080
0x004C			unsigned long AlignMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	unsigned long EncodeFlagMask	0x007C
0x004C	uintptr_t AlignMask													0x0088
0x0050				struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	struct _HEAP_ENTRY Encoding	0x0080
0x0050	struct _LIST_ENTRY VirtualAllocdBlocks	struct _LIST_ENTRY VirtualAllocdBlocks	struct _LIST_ENTRY VirtualAllocdBlocks											0x0090
0x0058				uintptr_t PointerKey	uintptr_t PointerKey	uintptr_t PointerKey	uintptr_t PointerKey	unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor	0x0090
0x0058	struct _HEAP_SEGMENT *[64] Segments	struct _HEAP_SEGMENT *[64] Segments	struct _HEAP_SEGMENT *[64] Segments											0x00A0
0x005C								unsigned long VirtualMemoryThreshold	unsigned long VirtualMemoryThreshold	unsigned long VirtualMemoryThreshold	unsigned long VirtualMemoryThreshold	unsigned long VirtualMemoryThreshold	unsigned long VirtualMemoryThreshold	0x0094
0x005C				unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor	unsigned long Interceptor							0x0098
0x0060								unsigned long Signature	unsigned long Signature	unsigned long Signature	unsigned long Signature	unsigned long Signature	unsigned long Signature	0x0098
0x0060				unsigned long VirtualMemoryThreshold										0x009C
0x0064				unsigned long Signature				uintptr_t SegmentReserve						0x00A0
0x0068				uintptr_t SegmentReserve				uintptr_t SegmentCommit						0x00A8
0x006C				uintptr_t SegmentCommit				uintptr_t DeCommitFreeBlockThreshold						0x00B0
0x0070				uintptr_t DeCommitFreeBlockThreshold				uintptr_t DeCommitTotalFreeThreshold						0x00B8
0x0074				uintptr_t DeCommitTotalFreeThreshold				uintptr_t TotalFreeSize						0x00C0
0x0078				uintptr_t TotalFreeSize				uintptr_t MaximumAllocationSize						0x00C8
0x007C				uintptr_t MaximumAllocationSize				uint16_t ProcessHeapsListIndex						0x00D0
0x007E								uint16_t HeaderValidateLength						0x00D2
0x0080				uint16_t ProcessHeapsListIndex				void * HeaderValidateCopy						0x00D8
0x0082				uint16_t HeaderValidateLength										0x00DA
0x0084				void * HeaderValidateCopy				uint16_t NextAvailableTagIndex						0x00E0
0x0086								uint16_t MaximumTagIndex						0x00E2
0x0088				uint16_t NextAvailableTagIndex				struct _HEAP_TAG_ENTRY * TagEntries						0x00E8
0x008A				uint16_t MaximumTagIndex										0x00EA
0x008C				struct _HEAP_TAG_ENTRY * TagEntries				struct _LIST_ENTRY UCRList						0x00F0
0x0090				struct _LIST_ENTRY UCRList										0x00F8
0x0094								uintptr_t AlignRound						0x0100
0x0098				uintptr_t AlignRound				uintptr_t AlignMask						0x0108
0x009C				uintptr_t AlignMask				struct _LIST_ENTRY VirtualAllocdBlocks						0x0110
0x00A0				struct _LIST_ENTRY VirtualAllocdBlocks										0x0118
0x00A4								struct _LIST_ENTRY SegmentList						0x0120
0x00A8				struct _LIST_ENTRY SegmentList	struct _LIST_ENTRY SegmentList	struct _LIST_ENTRY SegmentList	struct _LIST_ENTRY SegmentList							0x0128
0x00AC								uint16_t AllocatorBackTraceIndex						0x0130
0x00B0								unsigned long NonDedicatedListLength	unsigned long NonDedicatedListLength	unsigned long NonDedicatedListLength	unsigned long NonDedicatedListLength	unsigned long NonDedicatedListLength	unsigned long NonDedicatedListLength	0x0134
0x00B0				uint16_t AllocatorBackTraceIndex	uint16_t AllocatorBackTraceIndex	uint16_t AllocatorBackTraceIndex	uint16_t AllocatorBackTraceIndex							0x0138
0x00B4								void * BlocksIndex						0x0138
0x00B4				unsigned long NonDedicatedListLength										0x013C
0x00B8				void * BlocksIndex				void * UCRIndex						0x0140
0x00BC				void * UCRIndex				struct _HEAP_PSEUDO_TAG_ENTRY * PseudoTagEntries						0x0148
0x00C0				struct _HEAP_PSEUDO_TAG_ENTRY * PseudoTagEntries				struct _LIST_ENTRY FreeLists						0x0150
0x00C4				struct _LIST_ENTRY FreeLists										0x0158
0x00C8								struct _HEAP_LOCK * LockVariable						0x0160
0x00CC				struct _HEAP_LOCK * LockVariable				function * CommitRoutine						0x0168
0x00D0				function * CommitRoutine				void * FrontEndHeap						0x0170
0x00D4				void * FrontEndHeap				uint16_t FrontHeapLockCount						0x0178
0x00D6								uint8_t FrontEndHeapType						0x017A
0x00D7								uint8_t RequestedFrontEndHeapType						0x017B
0x00D8				uint16_t FrontHeapLockCount				uint16_t * FrontEndHeapUsageData						0x0180
0x00DA				uint8_t FrontEndHeapType										0x0182
0x00DC				struct _HEAP_COUNTERS Counters		struct _HEAP_COUNTERS Counters		uint16_t FrontEndHeapMaximumIndex						0x0188
0x00DE								uint8_t[257] FrontEndHeapStatusBitmap	uint8_t[129] FrontEndHeapStatusBitmap	volatile uint8_t[257] FrontEndHeapStatusBitmap	volatile uint8_t[129] FrontEndHeapStatusBitmap	volatile uint8_t[257] FrontEndHeapStatusBitmap	volatile uint8_t[129] FrontEndHeapStatusBitmap	0x018A
0x0124				struct _HEAP_TUNING_PARAMETERS TuningParameters										0x01E8
0x0130						struct _HEAP_TUNING_PARAMETERS TuningParameters								0x01F8
0x0158	union __unnamed u	union <unnamed-tag> u												0x02A0
0x0168	union __unnamed u2	union <unnamed-tag> u2												0x02B0
0x016A	uint16_t AllocatorBackTraceIndex													0x02B2
0x016C	unsigned long NonDedicatedListLength													0x02B4
0x0170	void * LargeBlocksIndex													0x02B8
0x0174	struct _HEAP_PSEUDO_TAG_ENTRY * PseudoTagEntries													0x02C0
0x0178	struct _LIST_ENTRY[128] FreeLists	struct _LIST_ENTRY[128] FreeLists	struct _LIST_ENTRY[128] FreeLists											0x02C8
0x01E0								struct _HEAP_COUNTERS Counters						0x0210
0x023C								struct _HEAP_TUNING_PARAMETERS TuningParameters						0x0288
0x0578	struct _HEAP_LOCK * LockVariable													0x0AC8
0x057C	function * CommitRoutine													0x0AD0
0x0580	void * FrontEndHeap													0x0AD8
0x0584	uint16_t FrontHeapLockCount													0x0AE0
0x0586	uint8_t FrontEndHeapType													0x0AE2
0x0587	uint8_t LastSegmentIndex													0x0AE3