Liam's OS file editor

[NightVisions]

I searched on the forum about this and didn't find much. I was curious why or what this tool is for? Like what can I edit more easily through text then using the websites editing tools. I just don't really understand. Here's a link to it: https://tiusic.com/os_proto.html 
If you have an explanation I'll be grateful and anyone searching for details about this tool in the future will be happy I'm sure as well