RtlLargeIntegerLessThan

BOOLEAN
    RtlLargeIntegerLessThan(

        IN LARGE_INTEGER  Operand1,
        IN LARGE_INTEGER  Operand2
        );

RtlLargeIntegerLessThan is exported to support existing driver binaries and is obsolete. For better performance, use the compiler support for 64-bit integer operations.