Me too. To this Day our national Electric invoice standard uses ISO-8859-15. An that's just fine until somebody feels the need to have a look with Notepad, add a random space and save the file.
Notepad then helpfully changes the encoding to UTF-16 and the whole patch errors out somewhere down the chain.
At work I have to use Windows, Notepad++ is my safe place. It is fast, there's plugins for years, and it handles (with some wait time) 100 000 line long documents.