You can paste an eD2k link, let the client identify the file, and then right-click to "Copy Magnet Link" once it has hashed the file for the BitTorrent network.
These links belong to the eDonkey2000 network (eMule) [1, 2]. They rely on central servers or a decentralized Kad network to locate files based on an MD4 cryptographic hash [1, 2]. Convert Ed2k To Magnet