How can I use wpg_docload.download_file and prompt the user to save it?

Question

Hi,
Posted about this a couple of weeks ago with a text file and got the following code (where x.zip=x.txt) and it worked fine. Problem is that I need to do this with zip files, and when I run the code below, it simply displays the zip file, rather than prompting the user to save the file. Have tried every mime type under the sun. No joy.
The How to Upload and Download Files in an Application Advanced Tutorial for Release 3.2 does not work for APEX4. Simply creating a file browse item leads to Error ORA-20999: P3_FILE_NAME has to have a valid BLOB column as source. and so I cannot follow that tutorial to get further clues on how to make this work.
Susan
Thanks and here's the wpg_docload.download_file code that displays a binary file:
declare
lob_loc bfile;
v_length integer;
fname varchar2(100) := 'x.zip';
l_blob blob;
des_offset number := 1;
src_offset number := 1;
begin
lob_loc := bfilename('CELFILES_9906', fname);
v_length := dbms_lob.getlength(lob_loc);
DBMS_LOB.createtemporary(l_blob, FALSE);
dbms_lob.open(lob_loc, dbms_lob.lob_readonly);
DBMS_LOB.LOADBLOBFROMFILE(
dest_lob=>l_blob,
src_bfile=>lob_loc,
amount=>v_length,
dest_offset=>des_offset,
src_offset=>src_offset);
owa_util.mime_header('application/zip', false);
htp.p('Content-length: ' || v_length);
htp.p('Content-Disposition: inline; filename="' || fname || '"');
-- close the headers
owa_util.http_header_close;
-- download the BLOB
wpg_docload.download_file( l_blob );
DBMS_LOB.freetemporary(l_blob);
EXCEPTION WHEN OTHERS THEN
DBMS_LOB.freetemporary(l_blob);
RAISE;
end;

Answer 1

I downlod blobs like this without issue (using IE7 and FF):
owa_util.mime_header('application/octet', False);
HTP.p ('Content-length: ' || DBMS_LOB.getlength (l_blob));
htp.p('Content-Disposition: attachment; filename="'||v('P20_FNAME')||'"');
OWA_UTIL.http_header_close;
WPG_DOCLOAD.download_file (l_blob);
...Remember, that it's your browser's MIME type settings that determine whether to pop up a save diaglog box. In FF 3.6 > Tools > Options > Applications > Content type. The set action for each mime type.