Yeah, that's right.
I have same problem, the file is not in a japanese name so that's why.
It seem some kanji word, it's change to " ・" character. If you know the kanji that is missing and fill it with your own ability, it should be fine.
But it's hard to write the kanji, if you not know japanese.
You have to use Japan system unicode before 'add archive' if not when extract a file, it'll be a problem like this.