7Z 转 ZIP
把 7Z 压缩包转成通用的 ZIP，供没装 7-Zip 的收件人使用。
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7Z
The 7-Zip archive format, known for strong compression that often beats ZIP. Best opened with 7-Zip or a compatible app.
ZIP
The universal archive format. Bundles files and folders into one compressed file that opens on any system without extra software.