Purpose of Icons folder files?

I've been wondering for a good while now what the files like "icon-114.png" actually do. I noticed they don't actually do anything to change the icon of NWJS when you export. As far as I can tell they just sit around and look pretty.

Those are the icons you see when you export your project and open it up in a browser. To change the NW.js export's icon you'll have to use a resource editor. For ex.: http://www.angusj.com/resourcehacker/

Yeah I know from reading that I need a resource editor. Just my first game in C2 is being built for NWJS so I wasn't sure what the icons did. Thanks.