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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
IFD - Extension Details
Date Added: January 01, 1970
File Extension:  .IFD
Description 1: .IFD file extension is linked with JetForm Design Form. JetForm was a Canadian software manufacturer produced by James Bursey and it was based in Ottawa, Ontario. The electronic form software have also adapted the name of the company. JetForm had main offices in the US, in various European countries, in Australia and New Zealand. JetForm Design is a development and graphic design tool for producing electronic replicas of paper forms. Adobe acquired JetForm in 2001 and in 2007 it is renamed Adobe LiveCycle Output ES, which is an inclusion in the Adobe LiveCycle Suite.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows & Mac: Adobe LiveCycle
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