Читать можно, к примеру, так:
Код
typedef __packed struct
{
unsigned short b15_0;
unsigned short b16_31;
unsigned int b32_63;
unsigned int b64_95;
} UNIQUE_ID;
const UNIQUE_ID *id = (UNIQUE_ID*) 0x1FFFF7E8;
unsigned int id_l, id_m, id_h;
id_l = id->b15_0 | (id->b16_31 << 16);
id_m = id->b32_63;
id_h = id->b64_95;