I don't know much about what you want to do but the new emo-icons have to be put on your computer in such a way that messenger knows about them. That would probably involve modifying either configuration file(s) and/or the registry. The best way to do that would be by importing them or by using emot-icons that come in an automatic installer.

Most programs and program add-ons either have to be installed or (if the program has this an an option) imported and can't be copied from one computer to another because program installation involves adding to the registry, adding/changing configuration files, as well as possibly adding/updating system files. Usually only the program manufacturer knows which of those needs to be done and how. It is safest for your system to either install programs/add-ons or to import add-ons. Does this make sense?

Changing files yourself or changing file types could very well prevent the program from using an add-on or even corrupt the program depending on what was changed, how, and how the program uses it.

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