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In the world of P2P, the file extension .met is most commonly associated to a particular file, called server.met.
The server.met file includes a list of known eMule/eDonkey servers, assisting these clients on how to connect to the ed2k network, which is "hub-based" P2P network, rather than truly distributed P2P network.
Related software tools
eDonkey2000 Windows GUI Client (Freeware)
eDonkey2000 is a new peer-to-peer file sharing application that combines the good features from both Napster and Gnutella.
eMule (Open source)
eMule is a very good open-source P2P tool that uses the same protocol as eDonkey2000.
eMule Plus (Open source)
eMule Plus is a new generation eMule compatible P2P client created to improve the original GUI and to bring you the best experience ever.