fstream with more than 3 giga

Ineed to use the std::fstream class in a windows program. The problem is that most of the files have more than 3 giga . In ux system we have the compiler directive -D_FILE_OFFSET_BIT=64 that solves the problem, whow to implement this in VC6.0?
Thank for any help
Rabelo
[288 byte] By [Rabelo] at [2007-11-18 17:34:47]