Hi Nima,
I don't know if it is relevant this thread but I am working in a way to enable a link to attachment service with news package. This way I pretend upload to file-storage files really relevant to a single news item so a user could download them directly.
You can see the initial job at http://oacs-cf.intertexto.info:8002/noticias-pncf/ (choose an news item an you see a list for attached files to - not formatted yet :) )
Thanks to file-storage integration we can choose an attach uploaded via webdav
OpenACS really rocks!
\Orzenil