隐藏已知文件类型的扩展名
Hide the extensions of known file types
以上为机器翻译结果，长、整句建议使用 人工翻译 。
隐藏已知的文件类型的扩展名之后，结果是为全部大写的FBI。
After extensions for known file types were hidden, the result was an all-uppercase FBI.
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