i believe your credits from other clients only last a couple of mouths anyway, then there reset to nil
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Known.met
The Known.met saves all files eMule knows of whether they are shared files, files currently in the download list or downloaded in the past. For every file information like file size, filename, hash sets, hash values and some statistics are saved. If you delete this file, eMule will have to rehash all files on the next restart. If you don't want eMule to remember downloaded files, disable the "Remember downloaded files" option in the preferences.
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Known2_64.met
Stores AICH hashes of all downloaded and / or shared files. If you delete this file, eMule will have to rehash all files on the next restart. If you don't want eMule to remember downloaded files, disable the "Remember downloaded files" option in the preferences.
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Known2.met
This file is not used by eMule anymore. If you do not plan to downgrade to an earlier version, you can delete this file.