Also, if you install notepad++ using the “portable” option (at least I think that is what it is called), then most (perhaps all) your files will be somewhere within the directory where you install. Then you can simply zip up that directory and unzip it on some other computer.
I’ve been sharing my notepad++ setup with co-workers this way for some time now. They get all my plug-ins, various XML configuration files, user-defined languages etc. as if they were part of notepad++.