... 缺省扩展名 DefaultExt 相关扩展名 associated file extension 改变文件扩展名 change file extensions ...
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文件扩展名（.html 和 .cgi）没有提供与用户相关的任何语义信息，长远来看，实际上会导致出现问题。
The filename extensions (.html and .cgi) provide no semantic information that is relevant to the user and actually cause problems in the long run.
为每个MIME类型，信息相关的文件扩展名并安装插件也显示出来。
For each MIME type, information about the associated file extension and installed plugin is also displayed.
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