At the end of a filename there is usually a 3 letter combination ( sometimes 1 or 2 or 4 letters ) following a dot. This tells the operating system what type of file it is. It therefore tells the OS how to handle the file. Examples are .HTML, .TXT, .EXE.
A sequence of characters that begins with a period (.) and is added to a filename to indicate the function or contents of the file. See also See also language extension..
A period (.) and one to three characters that can be appended to a filename. See also filename.
a string of characters beginning with a period and followed by one to three 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"
Two, three, or four characters at the end of a filename to indicate to computers without file typing what kind of file it is. For example, a filename ending in .sit indicates a StuffIt binary; a filename ending in .html indicates a file in HTML, or Hypertext Markup Language.
In DOS and some other operating systems, one or several letters at the end of a filename. Filename extensions usually follow a period (dot) and indicate the type of information stored in the file. For example, in the filename LETTER.DOC, the extension is DOC, which indicates that the file is a word processing file. See filename.
In DOS- and Windows-based software, the two or three letters that typically follow the period (or dot) in a file name. With graphics files the three letters denote the type of file or the software used to create the file. Examples are: (DXF) Dynamic Exchange Format; (AI) Adobe Illustrator; (BMP) Bitmap, (CDR) Corel Draw.
A tag of usually threee letters which identifies the format of the file, so that programs will recognise it and be able to open it. Eg ".doc" a document file
Last three or four letters of a file name that appear after the dot. Used to designate the type of file and the format used.
Commonly a three or four-letter extension on the end of a file name designating the file type. Examples are: .txt (text file), .gif (Graphics Interchange Format).
A three-letter (usually) code at the end of a filename that indicates what type of file it is. Essential in non-Macintosh environments that lack icons or other methods of identifying files. Common extensions include .txt for text files, .hqx for BinHexed files, and .sit for StuffIt files.
The one to three characters after the period following the base name in a file specification. external buffer.
A three-letter (usually) code at the end of a filename that indicates file type. Common extensions include .txt for text files, .exe for application files, and .ini for initialization files.
A filename extension is a suffix to the name of a computer file applied to show its format. It is commonly used to infer information about what sort of data might be stored in the file. The description above is meant to mostly explain the intent of filename extensions: a true definition, giving the criterion for deciding what part of the file name is its extension, belongs to the rules of the specific filesystem used; most times the extension is the substring which follows the last occurrence, if any, of the dot character (e.g. "txt" is the extension of the filename "readme.txt", "html" the extension of "mysite.index.html").
