How do I create an icon for a NW.js exported game

Hello,

As stated in the title, I'd like to create a customized icon to replace the default NW.js icon.

I've found this tutorial, which suggest using Format Factory and Ressource Hacker, but the tutorial is nearly 2 years old. Isn't there a more "official" way to create an icon for a NW.js project?

Thanks in advance!