2.2.2.2 OLD_LARGE_INTEGER
The OLD_LARGE_INTEGER structure defines a 64-bit value that is accessible in two 4-byte chunks.
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typedef struct _OLD_LARGE_INTEGER { unsigned long LowPart; long HighPart; } OLD_LARGE_INTEGER, *POLD_LARGE_INTEGER;
LowPart: The least-significant portion of a 64-bit value.
HighPart: The most-significant portion of a 64-bit value.