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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
AB1 - Extension Details
Date Added: July 09, 2008
File Extension:  .AB1
Description 1: .AB1 file extension is linked with ABIF file format a binary file format used in data storage. .AB1 file extension is associated with applications such as Chromas Lite from Technelysium Pty. Ltd. a freeware and a simplified version of ChromasPro, and ChromasPro, also from the same developer an application that is used to open Applied Biosystems chromatogram files.
Description 2: .AB1 file extension is linked with DNA Base Chromatogram file. The raw DNA information is taken from a scientific machine/instrument and the output from the sequencing analysis software [from such companies as Applied Biosystems]. The file contains the DNA base sequence and the electropherogram, all of which can be viewed via DNA viewer application. This is a standard file and is supported by various programs. .AB1 file extension is also associated with DNA Baser from CubicDesign.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Applied Biosystems Sequencing Analysis Software, BioEdit, CubicDesign DNA Baser, Geospiza FinchTV, Technelysium Chromas Lite or ChromasPro; Mac: Applied Biosystems EditView or 3100 Conversion Utility, Geospiza FinchTV
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