Got ED2K download link, but don’t know how to open it? Try aMule, eMule based app that works in most Linux Distributions.
ED2K (aka eDonkey2000) is a peer to peer file sharing network. The original project has discontinued, but the popular open-source fork eMule is still alive. As eMule is Windows only app, aMule forked it with multi-platform (Linux, FreeBSD, OpenBSD, Windows, MacOS X and X-Box) support.