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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:
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ABD - Extension Details
Date Added: August 02, 2009
File Extension:  .ABD
Description 1: .ABI file extension is linked with DNA Chromatogram File. This file contains the DNA sequence info that is recorded by a DNA analysis instrument. It is also referred to a DNA trace file or an electropherogram file. It can be graphically viewed via .ABI file viewer in order to analyze and compare the DNA sequences. The standard .ABI file extension is supported by various programs.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Applied Biosystems Sequencing Analysis Software, BioEdit, CubicDesign DNA Baser, Geospiza FinchTV, Nucleics QualTrace; Mac: 4Peaks, Applied Biosystems EditViewer or 3100 Conversion Utility, Geospiza FinchTV. Sequencher; Unix: EMBOXX abiview, Nucleics QualTrace
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