Use the -mcp switch with Code Page 932 (Japanese) to extract: 7z x "YourFile.7z" -mcp=932
Version 19 and later have improved handling of Japanese half-width kana, reducing the occurrence of garbled text. Japanese.7z
Modern 7-Zip fully supports Unicode, but if the archive was created with an old tool using SJIS, it needs special handling. Use the -mcp switch with Code Page 932
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