If you get any search results at all I think it is surefire that you can download files.

To conduct your port scan properly, you should run up the client and pick a port first, otherwise the port will not be seen as open.

Here is an interesting article which will show you the problem from a sysadmin's point of view:

http://www.nwconnection.com/2001_09/gnutel91/index.html