QQ mailbox preview file shows garbled code, and the root file has nothing to do with it. Just showing the problem. It is usually caused by your browser's wrong recognition of the code. You can reselect the appropriate code and set it on the preview page. Right-click the browser space of the attachment, select the code, and then select the appropriate encoding format. If your browser defaults to GB23 12, you can switch UTF-8. In general, you can choose one of the three codes: GB23 12, UTF-8 and GB 18030.

Thank you, hope to adopt.