Thank you for your comment.
I can't come up with anything more detailed than this article on how to use it easily. I'm sorry.
Character Generator Program - PIPOYA FREE RPG Character Sprites 32x32 by pipoya
https://pipoya.itch.io/pipoya-free-rpg-character-sprites-32x32/devlog/108932/character-generator-program
I think the content of the article and the comments posted would also be helpful.
However, the problem of Japanese file names still occurs inevitably.