<?
header( "Content-type: application/x-gzip" );
header( "Content-Disposition: attachment; filename=file.ext" );
header( "Content-Description: whatever" );
?>

mozhe na mqstoto na file da slozhish i neshto koeto se poluchava kato parametyr. i btw polvinata reshenie na daden problem e v pravilnata konstrukciq na vyprosa ;P

bofh