Min version	XP SP2	Vista	Vista SP1	8 Pre RTM		8.1 Update 1	8.1	10 Pre RTM
Max version	XP SP3	7 SP1		8			10 Pre RTM	10 TH2
Architecture	x86	x86	x64	x86	x64	x86	x64	x86	x64
x86 offset offset:bitpos	Field Name									x64 offset offset:bitpos
			void * PreviousBlockPrivateData		void * PreviousBlockPrivateData		void * PreviousBlockPrivateData		struct _HEAP_ENTRY HeapEntry	0x0000
			void * Reserved		void * Reserved		void * Reserved		struct _HEAP_UNPACKED_ENTRY UnpackedEntry	0x0000
			void * ReservedForAlignment		void * ReservedForAlignment		void * ReservedForAlignment		void * PreviousBlockPrivateData	0x0000
									struct _HEAP_EXTENDED_ENTRY ExtendedEntry	0x0000
									void * Reserved	0x0000
									void * ReservedForAlignment	0x0000
0x0000	uint16_t Size							struct _HEAP_ENTRY HeapEntry	uint16_t Size	0x0008
0x0000	void * volatile SubSegmentCode	void * volatile SubSegmentCode	uint64_t CompactHeader	void * volatile SubSegmentCode	uint64_t CompactHeader	unsigned long SubSegmentCode		struct _HEAP_UNPACKED_ENTRY UnpackedEntry	unsigned long SubSegmentCode	0x0008
0x0000		uint16_t FunctionIndex					uint64_t CompactHeader	uint16_t Size	uint64_t CompactHeader	0x0008
0x0000		unsigned long InterceptorValue					uint16_t FunctionIndex	unsigned long SubSegmentCode	uint16_t FunctionIndex	0x0008
0x0000		unsigned long Code1					unsigned long InterceptorValue	struct _HEAP_EXTENDED_ENTRY ExtendedEntry	unsigned long InterceptorValue	0x0008
0x0000		uint64_t AgregateCode					unsigned long Code1	uint16_t FunctionIndex	unsigned long Code1	0x0008
0x0000							uint64_t AgregateCode	unsigned long InterceptorValue	uint64_t AgregateCode	0x0008
0x0000								unsigned long Code1
0x0000								uint64_t AgregateCode
0x0002	uint16_t PreviousSize	uint8_t Flags								0x000A
0x0002		uint16_t ContextValue								0x000A
0x0003		uint8_t SmallTagIndex								0x000B
0x0004	uint8_t SmallTagIndex	uint16_t PreviousSize								0x000C
0x0004		uint16_t UnusedBytesLength								0x000C
0x0004		uint16_t Code2		uint16_t Code2						0x000C
0x0004				unsigned long Code234						0x000C
0x0005	uint8_t Flags
0x0006	uint8_t UnusedBytes	uint8_t SegmentOffset								0x000E
0x0006		uint8_t LFHFlags								0x000E
0x0006		uint8_t EntryOffset								0x000E
0x0006		uint8_t Code3								0x000E
0x0007	volatile uint8_t SegmentIndex	uint8_t UnusedBytes								0x000F
0x0007		uint8_t ExtendedBlockSignature								0x000F
0x0007		uint8_t Code4								0x000F
0x0008	struct _LIST_ENTRY FreeList									0x0010