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These are mods.
To see what they are and to check on them from time to time, trot on over to the eMule mods forum here. (registration required)
eMule and all of it's mods are constantly being worked on and new versions are coming out all the time. You're likely to see differences in the versions as time goes on.
If you are using a modified version of eMule, check the mod forum (linked above) and go to the forum for the particular mod you are using for any info about that mod.