Bug in Excel's (not VBA's) MOD function

The value 12,345,678,000 is too large to store as a long integer but well
within the range of integers that a double precision floating point real can
store. Excel's worksheet MOD function seems to be able to work with reals,
e.g., MOD(2.25,1/3) returns 0.25 and MOD(2.5,1/3) returns 0.166666666666667.
However, there seems to be a glitch in it when it comes to large integer
values divided by small integer values.

For instance, MOD(12345678000,64) returns #NUM! even though the equivalent
(per online help) expression 12345678000-64*INT(12345678000/64) returns 48
as expected. Clearly Excel's worksheet MOD function isn't just argument
checking wrapped around a call to standard C's fmod(3) call. [No, Microsoft
must have decided they needed to 'enhance' it.]

Maybe this is just a glitch on this particular machine. Does anyone else get
#NUM! from the preceding MOD call? I'm running Excel 97 SR-2 and 2000 SP-3
on this particular machine.