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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
FA - Extension Details
Date Added: November 03, 2009
File Extension:  .FA
Description 1: .FA file extension is linked with FASTA Formatted Sequence Alignment. This file contains either the nucleic acid sequence [DNA] or protein sequence information. This file is formatted using .FASTA file format which can store several sequences in a single file. .FA files can be analyzed using various DNA sequencing applications. The standard .FA file format is supported by various programs.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: CubicDesign DNA Baser, GeneStudio SeqVerter, Geospiza FinchTV; Mac: 4Peaks, Geospiza FinchTV; Unix: EMBOSS abiview
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