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2 definitions found
 for filename extension
From WordNet (r) 3.0 (2006) :

  filename extension
      n 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 applications provide extensions
           for the files they create"; "most BASIC files use the
           filename extension .BAS" [syn: extension, filename
           extension, file name extension]

From The Free On-line Dictionary of Computing (30 December 2018) :

  filename extension
  file extension
      The portion of a filename, following the
     final point, which indicates the kind of data stored in the
     file - the file type.
     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.
     Tony Warr's comprehensive list
     FAQS.org Graphics formats

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