Min version	8 Pre RTM
Max version	10 TH2
x64 offset offset:bitpos	Field Name
0x0000	uint16_t Reserved1
0x0002	uint16_t ExtType
0x0004:0x00	uint16_t Linkage
0x0004:0x01	uint16_t Reserved2
0x0006	uint16_t DataSize
0x0008	uint64_t DataPtr