UNICODE I/O

I would like to write a program that can handle non-ANSI characters.
The following code does not work, the output is empty:

#include <fstream>
#include <string>
using namespace std;

int main() {
       wofstream out(L"log");
       if (!out)
               exit(127);
       wstring s(L"=F5=FB=ED=D5=DB=CD");
       out << s << endl;
       out.close();
       return 0;
}

The log file is in ANSI char encoding, and probably that is why the
output fails.

Could anyone help me how to do this?

Many thanks.