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filename extension meaning

  "filename extension" in a sentence
  • Noun: filename extension
    1. A string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
      "most BASIC files use the filename extension .BAS"
      - extension, file name extension

    Derived forms: file name extensions, filename extensions

    Type of: string

    Part of: computer file name, computer filename, file name, filename

    Encyclopedia: Filename extension


  • [Electronics]
    A group of one, two, or three characters following the main body of a FILENAME, and separated from it by a period (.). It generally denotes the application or purpose of the file. The extension .BAK, for example, denotes a backup file; .TXT denotes a text file; .BMP denotes a bit-mapped graphics file.

  • [Computer]
    <filename extension> The portion of a filename, following the final point, which indicates the kind of data stored in the file.

    Many operating systems use filename extensions, e.g. Unix, VMS, MS-DOS, Microsoft Windows. They are usually from one to three letters (some sad old OSes support no more than three). Examples include "c" for C source code, "ps" for PostScript, "txt" for arbitrary text.

    NEXTSTEP and its descendants also use extensions on directories for a similar purpose.

    Apart from informing the user what type of content the file holds, filename extensions are typically used to decide which program to launch when a file is "run", e.g. by double-clicking it in a GUI file browser. They are also used by Unix's make to determine how to build one kind of file from another.

    Compare: MIME type.

Examples

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  1. is not found, or a filename extension is not specified
  2. if you change a filename extension, the file may become unusable
  3. is not found, or the module you are trying to load does not specify a filename extension
  4. The common filename extension of WordPerfect document files is . wpd.
  5. By convention, Vue scripts have a . e filename extension.

Related Words

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PC Version