[_m3]

http://msdn.microsoft.com/library/de...html/int64.asp

In the printf family of run-time library functions, the format for optional prefixes includes I64, in addition to F, N, h, l, and L. For example, the following statement includes an example of a valid format string:

printf("%I64d", x);

When manipulating 64-bit integers, no special functions are necessary. Ordinary arithmetic operators and operations behave as expected.