i write this code to read the first byte from my EXE and compare it
with the entered EXE file
the byte read from both files supposed to be the same but that's don't
happened!!
i tried also with different EXE's but it also failed to read the first
byte which is "M"
--
here is the code:

FILE *a,*b;
int z;
char str1[2];
char str2[2];

a= fopen(argv[0],"rb"); //try to change both file with
another EXE's and u will also fail
b= fopen(argv[1],"rb+");

z= fread(str1,1,1,a);
if (z !=1)
printf("-101");

z= fread(str2,1,1,b);
if (z !=1)
printf("-102");

if(str1 == str2)
{
fwrite("a",1,1,b); // i want to change the first byte
with this char
printf("OK");
}else{
fwrite(str1,1,1,b);
printf("NO");
}
fclose(a);
fclose(b);