System file

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. (Although the system attribute can be manually put on any arbitrary file; these files do not become system files.) Specific example of system files include the files with `.sys` filename extension in MS-DOS. In Windows NT family, the system files are mainly under the folder `C:\Windows\System32`. In Mac OS they are in the System suitcase. And in Linux system the system files are located under folders `/boot` (the kernel itself), `/usr/sbin` (system utilities) and `/usr/lib/modules` (kernel device drivers).

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Computer files

Types|

* Binary file / text file
* File format
* List of file formats
* File signatures
* Magic number
* Metafile
* Sidecar file
* Sparse file
* Swap file
* System file
* Temporary file
* Zero-byte file

Properties|

* Filename
* 8.3 filename
* Long filename
* Filename mangling
* Filename extension
* List of filename extensions
* File attribute
* Extended file attributes
* File size
* Hidden file / Hidden directory

Organisation|

* Directory/folder
* NTFS junction point
* Temporary folder
* Directory structure
* File sequence
* File system
* Filesystem Hierarchy Standard
* Path

Operations|

* Open
* Close
* Read
* Write

Linking|

* Alias
* File descriptor
* Hard link
* Shadow
* Shortcut
* Symbolic link

Management|

* File comparison
* File compression
* File manager
* Comparison of file managers
* File system permissions
* File transfer
* File sharing
* File verification

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