File Written in Chinese (I think?)

I have an assignment to create my own version of UNIX ar, in C. I broke the assignment up into several pieces and I am just trying to write the file names into another file(which will be my archive file) at this point. I can create the file, and when I use printfs to make sure I'm getting the proper arguments from the command line, the file names are correct. When I open the file that I have created that is suppose to hold those file names, everything is in an Asian language.

I've researched the problem and haven't found much to go on. The only thing I did find was something about the files being encoded differently, but I'm pretty confused at this point.

#include <stdlib.h>
#include "ar.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

int main (int argc, char **argv)
{
    char *file_name, *archive_name;
    size_t count = 50;
    int i, fd, num_written;

    //command line options to do later
    //argv[1]

    //get archive name
    archive_name = argv[2];

    //get file names to add to archive
    for (i = 3; i<argc; i++)
    {
        file_name = argv[i];
    }

    //create archive file
    fd = open(archive_name, O_RDWR |O_CREAT|O_APPEND);
    if (fd < 0){
        perror("Error while opening file.\n");
        exit(EXIT_FAILURE);
        }
    else
        printf("File %s opened successfully\n", archive_name);


    //write file names into archive file
        for (i = 3; i<argc; i++)
    {
        printf("file name: %s\n", argv[i]);
        num_written = write(fd, argv[i], 50);
        if (num_written == -1){
            perror("Error while writing to archive.\n");
            exit(EXIT_FAILURE);
            }

     }


    close(fd);

    return 0;

    }