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[Vane_]

Mira, al final lo hice así y funciona !!! (Esto es descarga.php)

<?php
$files_folder = "ruta";

$size = $files_folder;
if (detect_browser($HTTP_USER_AGENT) == "ie")
{
Header("Content-type: application/force-download");
}else{
Header("Content-Type: application/octet-stream");
}
Header("Content-Length: ".filesize($size));
Header("Content-Disposition: attachment;
filename=nombre_con_el_que_quieras_q_se_guarde");
readfile($size);
################################################## #######################


function detect_browser($var)
{
if(eregi("(msie) ([0-9]{1,2}.[0-9]{1,3})", $var))
{
$c = "ie";
}else{
$c = "nn";
}
return $c;
}
?>