Min version	2003/XP64 SP1	8
Max version	8 Pre RTM	10 TH2
x64 offset offset:bitpos	Field Name
0x0000	int16_t Type
0x0002	uint16_t Size
0x0004		uint16_t AllocationProcessorNumber
0x0006		uint16_t Reserved
0x0008	struct _MDL * MdlAddress
0x0010	unsigned long Flags
0x0018	union <unnamed-tag> AssociatedIrp
0x0020	struct _LIST_ENTRY ThreadListEntry
0x0030	struct _IO_STATUS_BLOCK IoStatus
0x0040	char RequestorMode
0x0041	uint8_t PendingReturned
0x0042	char StackCount
0x0043	char CurrentLocation
0x0044	uint8_t Cancel
0x0045	uint8_t CancelIrql
0x0046	char ApcEnvironment
0x0047	uint8_t AllocationFlags
0x0048	struct _IO_STATUS_BLOCK * UserIosb
0x0050	struct _KEVENT * UserEvent
0x0058	union <unnamed-tag> Overlay
0x0068	function * CancelRoutine
0x0070	void * UserBuffer
0x0078	union <unnamed-tag> Tail