The name of a file on a disk used so that both you and the operating system can find the file again. Every file in a directory must have a unique name, but files in different directories can share the same name.
   In MS-DOS, file and directory names have two parts. They can have up to eight characters in the name and up to three characters in the optional filename extension, separated from the name by a period. Many applications take over the extension part of the filename, using specific groups of characters to designate a particular file type. In the Macintosh operating system, filenames can be up to 32 characters and can contain any character exceptacolon(:),whichisused to separate elements of a path name. Microsoft Windows allows 255-character filenames including spaces, but the name cannot include any of the following characters: \ / : * ? " < > |.

Dictionary of networking . 2014.

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