While the term "editor" is used broadly, the modding community relies on a few specific tools to handle these files. It is important to note that "editing" an RX3 file is often a two-step process: using a tool to open the archive, and using image-editing software to modify the contents.
(e.g., a fantasy boot design) so you can draw it: rx3 file editor
Without an , these files are just encrypted gibberish. With one, they become a malleable digital sculpture ready for modification. While the term "editor" is used broadly, the