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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
ABC - Extension Details
Date Added: March 11, 2008
File Extension:  .ABC
Description 1: .ABC file extension is linked with the ABC Music Notation a software that is designed to notate musical tunes in ASCII format. ABC Music Notation was designed for traditional and folk tunes of the Western European origin [English, Irish and Scottish origins] which can be written in standard classical notation. ABC's goal is to allow humans to have computerbased musical languages that can be easily read. The ABC file extension and program is owned by Chris Walshaw.
Description 2: .ABC file extension is linked with ACT! Email Address Book. This is the file extension for the email address book utilized by ACT! a wellknown contact and customer manager designed to help users organize their contact information, enhance their communication for improved productivity and manage daily tasks. It integrates everyday usertools such as Microsoft Outlook, Word and Excel. ACT! is owned and developed by Best Software CRM Division.
Description 3: .ABC file extension is linked with iGrafx FlowCharter Data File. iGrafx FlowCharter is a fullfeatured, easytouse process analysis and modeling tool that helps organizations improve and understand their business processes. Users can create: flowcharts, Swimlane diagrams, process maps, value stream maps, FMEA spreadsheets, cause and effect diagrams, SIPOC charts, pick charts, BPEL exports, BPMN diagrams, organization charts, network diagrams and customized templates. .ABC file extension and FlowCharter are owned and developed by iGrafx [a Corel Corporation].
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: iGrafx FlowCharter
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