What I am looking for is a file system that will allow a Windows user to download a file from multiple sources without having to install a client application on the Windows users machine.

Basically like a BitTorrent, except without the client application. In the above example each LAN could have an "aggregator" that the users accesses to download the file, and then the aggregator assembles the blocks from different sources.
Ideally this would work through a download link on a web page, although that's not essential. What is important is that no software should have to be installed on the end-user computer to make this work.
Suggestions?

Basically like a BitTorrent, except without the client application. In the above example each LAN could have an "aggregator" that the users accesses to download the file, and then the aggregator assembles the blocks from different sources.
Ideally this would work through a download link on a web page, although that's not essential. What is important is that no software should have to be installed on the end-user computer to make this work.
Suggestions?