RtlEnlargedUnsignedDivide

ULONG
    RtlEnlargedUnsignedDivide(
        IN ULARGE_INTEGER  Dividend,
        IN ULONG  Divisor,
        IN OUT PULONG  Remainder
        );

RtlEnlargedUnsignedDivide is exported to support existing driver binaries and is obsolete.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