// how to use
hi2txt HISCORE > hiscore.txt
[edit hiscore.txt with a text editor]
txt2hi hiscore.txt HISCORE

// hi2txt.cpp

#include <stdio.h>

unsigned char hisc[328];

main (int argc, char **argv)
{
  int k, l;
  FILE *f = fopen (argv[1], "rb");
  while (!feof (f))
    {
      int n = fread (hisc, 328, 1, f);
      if (n <= 0)
	break;

      int *p = (int *) hisc;
      printf ("%10d ", *p);
      for (l = 4; l < 40; l++)
	printf ("%c", hisc[l] ^ 217);
      printf (" ");
      for (l = 0; l < 328; l++)
	printf ("%02x", hisc[l]);
      printf ("\n");
    }
  fclose (f);
}

// txt2hi.cpp

#include <stdio.h>

unsigned char hisc[328];

main (int argc, char **argv)
{
  int k, l;
  char buf[900];
  FILE *f = fopen (argv[1], "rt");
  FILE *g = fopen (argv[2], "wb");
  while (!feof (f))
    {
      buf[0] = 0;
      buf[1] = 0;
      buf[2] = 0;
      fgets (buf, 900, f);
      if (!buf[2])
	break;
      printf ("< %s\n", buf);
      for (int l = 0; l < 328; l++)
	{
	  int c;
	  sscanf (buf + 48 + 2 * l, "%02X", &c);
	  fputc (c, g);
	}
    }
  fclose (f);
  fclose (g);
}