@Coises said: What is really means is, when Notepad++ opens an existing file that contains only ASCII characters, it should treat it as UTF-8 rather than as ANSI. Yeah, so for example: “Treat ASCII-only files as UTF-8 (instead of ANSI)” or something similar could be a more clear wording for the option. Which, for me, raises the question: Why is this only available when UTF-8 is the default encoding for new files? It would add a bit more flexibility to the user, but on the other side it seems very unlikely to set this option if you don’t want UTF-8 as default. So I guess it could be a preventative measure that the user doesn’t set any confusing options.