Min version	XP	2003/XP64 SP1	Vista	Vista SP1
Max version	2003/XP64 SP2		10 TH2
Architecture	x86	x64	x86	x64
x86 offset offset:bitpos	Field Name				x64 offset offset:bitpos
0x0000	struct _HEAP_ENTRY Entry				0x0000
0x0008	unsigned long Signature		unsigned long SegmentSignature		0x0010
0x000C	unsigned long Flags		unsigned long SegmentFlags		0x0014
0x0010	struct _HEAP * Heap		struct _LIST_ENTRY SegmentListEntry		0x0018
0x0014	uintptr_t LargestUnCommittedRange				0x0020
0x0018	void * BaseAddress		struct _HEAP * Heap		0x0028
0x001C	unsigned long NumberOfPages		void * BaseAddress		0x0030
0x0020	struct _HEAP_ENTRY * FirstEntry		unsigned long NumberOfPages		0x0038
0x0024	struct _HEAP_ENTRY * LastValidEntry		struct _HEAP_ENTRY * FirstEntry		0x0040
0x0028	unsigned long NumberOfUnCommittedPages		struct _HEAP_ENTRY * LastValidEntry	struct _HEAP_ENTRY * LastValidEntry	0x0048
0x002C	unsigned long NumberOfUnCommittedRanges	unsigned long NumberOfUnCommittedRanges			0x004C
0x002C			unsigned long NumberOfUnCommittedPages	unsigned long NumberOfUnCommittedPages	0x0050
0x0030	struct _HEAP_UNCOMMMTTED_RANGE * UnCommittedRanges				0x0050
0x0030			unsigned long NumberOfUnCommittedRanges		0x0054
0x0034	uint16_t AllocatorBackTraceIndex		uint16_t SegmentAllocatorBackTraceIndex		0x0058
0x0036	uint16_t Reserved				0x005A
0x0038	struct _HEAP_ENTRY * LastEntryInSegment		struct _LIST_ENTRY UCRSegmentList		0x0060