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