Min version	2003/XP64 SP1	Vista SP1	8 Pre RTM	8.1	10 Pre RTM
Max version	2003/XP64 SP2	7 SP1	8	10 Pre RTM	10 TH2
x64 offset offset:bitpos	Field Name
0x0000	void * PreviousBlockPrivateData	void * PreviousBlockPrivateData			struct _HEAP_UNPACKED_ENTRY UnpackedEntry
0x0000		void * Reserved			void * PreviousBlockPrivateData
0x0000		void * ReservedForAlignment			struct _HEAP_EXTENDED_ENTRY ExtendedEntry
0x0000					void * Reserved
0x0000					void * ReservedForAlignment
0x0008	uint16_t Size
0x0008	uint64_t CompactHeader	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	uint16_t PreviousSize	uint8_t Flags
0x000A		uint16_t ContextValue
0x000B		uint8_t SmallTagIndex
0x000C	uint8_t SmallTagIndex	uint16_t PreviousSize
0x000C		uint16_t UnusedBytesLength
0x000C		uint16_t Code2	uint16_t Code2
0x000C			unsigned long Code234
0x000D	uint8_t Flags
0x000E	uint8_t UnusedBytes	uint8_t SegmentOffset
0x000E		uint8_t LFHFlags
0x000E		uint8_t EntryOffset
0x000E		uint8_t Code3
0x000F	uint8_t SegmentIndex	uint8_t UnusedBytes
0x000F		uint8_t ExtendedBlockSignature
0x000F		uint8_t Code4