RPGM WHAT IS A ".JSONO" FILE?

[Luxtos Wheater]

Hi, I want to translate a game made in rpgmaker (apparently MZ) but when I look in the data folder, the files are with an extension that I have never seen, is a ".jsono" format when I open it with any editor, I only see strange letters, so I think it is encrypted, but what method have they used to make a ".jsono".

Here the extension of the files:



Here when I open the file in some editor like Notepad++