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