7zzs (standalone 7-Zip) can be used without installation. If you tell me: Are you using Windows or macOS/Linux ? Are you using the GUI or Command Line ? I can provide the exact command or steps for your setup. Encrypting and decrypting archives with 7-Zip - Red Hat

A file containing Japanese characters often results in garbled file names (mojibake) when extracted on a system not set to Japanese locale. This happens because the archive likely uses an old non-Unicode character encoding (like Shift-JIS/Code Page 932) to store filenames.

If you need to extract many such files, temporarily change your Windows system locale to Japanese. Go to > Clock and Region > Region . Click the Administrative tab. Click Change system locale... and select Japanese (Japan) .

Restart your computer, extract the file, then change it back. Method C: Use Bandizip or WinRAR (Alternative)