Hi José, > Yes, if I use typedef I would to replace the definition in all my code and it would be dangerous. <stdint.h>'s int64_t is int64_t on all platforms which have a 64-bit integer type, for C. I'm not seeing the dangerousness. Unless you mean C++, which does not have int64_t (except by the C++ compilers which have added it as an extension, or added it in anticipation of C++0x). Sincerely, --Eljay