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System file

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A system file in computers is a critical computer file without which a computer system may not operate correctly. These files may come as part of the operating system, a third-party device driver or other sources. Microsoft Windows and MS-DOS mark their more valuable system files with a "system" attribute to protect them against accidental deletion. (The system attribute can be manually put on any arbitrary file, but setting the system attribute n a file does not cause the file to become a system files)