How to save a file into file system from database?

Hi!
I am using AppEx 2.2.1.I have created a report showing the filename and id of a table. The table has a blob column containing the file.I want to hyperlink filename, so that I can go ahead and save it into my file system. But I don't know what to give in the URL field of the filename column attributes. How to get the file id of a file already in the database to link it and use? Any ideas please.
Regards,
Deepa.

This is a reference for the file download:
http://download-uk.oracle.com/docs/cd/B31036_01/doc/appdev.22/b28839/up_dn_files.htm#CJAHDJDA
I have a demo page showing this as well:
http://htmldb.oracle.com/pls/otn/f?p=31517:15
Denes Kubicek

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