Untested auto enf-of-file checking
Code:
var var_to_read = 0;
var var_counter = 0;
var handle_of_file = file_open_read("FILE.txt");
...
while(1)
{
   var_to_read = file_var_read(handle_of_file);
   if(file_seek(handle_of_file,0,4) >= (file_length(handle_of_file)-0))
   {
       break;
    }
   var_counter++;
}

Because untested, the IF may need to check against
(file_length(handle_of_file)-1)
or
(file_length(handle_of_file)-2) or even -3, depending if file ends with a line-feed or not.

let us know how it goes...

"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial