Use the -mcp switch with Code Page 932 (Japanese) to extract: 7z x "YourFile.7z" -mcp=932
When extracting, you likely see file names appearing as ? , テスト , or other junk characters. This is because your system is interpreting the Shift-JIS encoding as standard Unicode (UTF-8) or ASCII. 2. Solutions for Extraction Method A: Using 7-Zip Command Line (Recommended) Japanese.7z
Alternatively, for a specific output directory: 7za.exe x -mcp=932 "YourFile.7z" -o"OutputFolder" Method B: Change System Locale (Windows) Use the -mcp switch with Code Page 932