filename extension

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Noun1.filename extension - 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"
computer file name, computer filename, file name, filename - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file
string - a linear sequence of symbols (characters or words or phrases)
References in periodicals archive ?
DNG, where ABC are the photographer's initials, 150915 indicate the date of 2015 Sep 15, 1234 is the unique identifier number or counter for the file, and DNG is the filename extension.
Word saves the backup files with a WBK filename extension.
FILENAME EXTENSION - IDs for types of files, usually ones which have been compressed.