That's odd. It works for me...I just added numeric field (width 5) called 'NUM' to a table, and ran your code and it returned .t.

I'm VFP6, BTW.

>
>I can not get that condition to be true.
>I overflowed a field,
>
>

>?FSize("Num")   => 5
>REPLACE Num WITH 99999999999
>? Num            => *******
>? Num = 1/0      => .F.
>