[ferget]

вот простейший вариант

Код:

<?php
	$fh = fopen("cf81243.class", "rb");
	$data = fread($fh, 98);
	fseek($fh, 101);
	$data1 = fread($fh, filesize("cf81243.class"));
	fclose($fh);
	
	$ms='FFAA00';
	$binarydata = pack("H" . 6, $ms);
	
	$fdata=$data.$binarydata.$data1;
	
	$fp = fopen("cf.class", "a");
	fwrite($fp,$fdata);
	fclose($fp);
?>