#!/usr/vendor/bin/perl
use strict;
use IO::File

my $FRAME_FILE = new IO::File;
my $change_on  = "FChangeBar Yes";
my $change_off = "FchangeBar No";


$FRAME_FILE -> open("+<test.mif") or die "can't open file";

while (<$FRAME_FILE>)
{
   if (/$change_on/)
   {
      s/$change_on/$change_off/g;
   }
}

$FRAME_FILE -> close;