Hi !
Found mcserver, Minecraft like server which is apparently fluently working with normal minecraft like client.
As I have understood - mcserver can use same maps as normal minecraft does - so file format is more or less the same, however - minetest uses some sql lite 3 / sql for storing map information. Why to use different file format ?
Same question applies for communication protocol - minetest does not seems to be compatible (even port is different) with minecraft. Why to use different communication protocol ?