...about small ".torrent" files
...and if you only have the small file which has the ".torrent" extension then for downloading its contents you use a "Bittorrent client". (If you have a recent version of the Opera browser you can use that too.) To find out what's a suitable Bittorrent client to try you can search LQ for threads about bittorrent. To install a client, and if you still run Ubuntu like you posted in your other thread, then you can use any of your menu selections ("Add/Remove", "Update Manager"), package manager (Synaptic) or commandline tools (apt-get, aptitude) to search for the term "torrent" or "bittorrent". Note depending on your available bandwidth, the bandwidth and amount of peers downloading torrents might take a while, but you can stop and resume at any time provided the torrent still has peers.