Min version	8.1	10 Pre RTM
Max version	8.1 Update 1	10 TH2
x64 offset offset:bitpos	Field Name
0x0000:0x00	uint64_t Count	uint64_t DelayFree
0x0000	void * AllBits	void * AllBits
0x0000:0x01		uint64_t Count
0x0000:0x3F	uint64_t DelayFree