Zipfile download - how to control the save as filename?

We've sucessfully created a portlet which allows us to serve up a zipfile. However when we run it, the default filename is ...ZIP_DOWNLOAD_DYN_TEST.show - which is the name of the portlet. How do you control that filename? Searching the MIME information didn't yeild any help. If you change the name to something reasonable, the download does work.
For reference here is the code we used
<HTML>
<HEAD>
<TITLE>Drawing PDF</TITLE>
</HEAD>
<BODY>
<fort class="PortletText2">SLA PDF
<ORACLE>
declare
network varchar2(8);
begin
select nms.nms_customer_network.return_network_val
into network from dual;
nms.xx_download_1(network, 'SLA');
end;
</ORACLE>
</BODY>
</HTML>
and the database procedure...
CREATE OR REPLACE procedure xx_download_1 (p_Network in varchar2, p_DocType in varchar2)
is
-- this is trial code for file download... BGL 5/17/2002
-- thanks to technet and Dmitry!
l_size integer;
l_blob blob;
l_tmpblob blob;
l_mimetype varchar2(4000);
l_rowid urowid;
begin
htp.init;
SELECT zipfile INTO l_blob
FROM nms.ziptest
--WHERE NETWORK_NUMBER = p_Network
l_size := dbms_lob.getlength(l_blob);
dbms_lob.createtemporary(l_tmpblob,true);
dbms_lob.copy(l_tmpblob,l_blob,l_size,1,1);
owa_util.mime_header('application/zip', false,null);
htp.p('Content-length: '|| l_size);
htp.p('Pragma: no-cache');
htp.p('Cache-Control: no-cache');
htp.p('Expires: Thu, 01 Jan 1970 12:00:00 GMT');
owa_util.http_header_close;
wpg_docload.download_file(l_tmpblob);
dbms_lob.freetemporary(l_tmpblob);
exception
when others then
owa_util.mime_header('text/html', false);
htp.p('Content-length: 0');
owa_util.http_header_close;
end xx_download_1;

Hello Bryan,
look at message http://forums.oracle.com/forums/message.jsp?id=625164, there is a short but good description how to set a filename.
Ralf

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