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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ABF - Extension Details
Date Added: January 01, 1970
File Extension:  .ABF
Description 1: .ABF file extension is linked with Adobe Binary Screen Font File. It is the ASCII textencoded font format of Adobes binaryencoded character bitmap distribution formation. Each file is madeup of an 8bit bytes sequence. The character bitmaps are in "strike format [rectangular pixel array]. The tallest character in the font is represented by the height of the rectangle, and the sum of all character widths is its width. "Adobe Glyph Bitmap Distribution Format is another name for ABF format. .ABF file extension and Adobe Binary Screen Font are owned and developed by Adobe Software.
File Type:   Font File
Mode: ASCII
Program(s) to Open:  Windows & Mac: used by programs/applications that access the system fonts
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