If you've had to reinstall Mabinogi Online for some reason, then you will probably want this file. Why? Because, when uninstalling Mabinogi, the computer leaves 1 file in the Mabinogi folder: npkcmsvc (nProtect KeyCrypt Manager Service). The original intent of this file is to stop hacking by only allowing a certain number of one type of keystroke in a row (essentially useless in Mabinogi ANYWAY, but whatever).
The problem is, however, that having this file in the folder will not allow Mabinogi to reinstall. It will cause an error. How2fix?
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That's the uninstall file for npkcmsvc. You could just MOVE the file, but this is better, as it removes the file completely, so you don't have to worry about that stupid crap.
Once it's downloaded you must place it in the same file directory as the npkcmsvc and then double click the downloaded file. Both files will then disappear from your computer.