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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
JEF - Extension Details
Date Added: March 11, 2008
File Extension:  .JEF
Description 1: .JEF file extension is linked with Customizer 11000 Embroidery Layout Software File. This application offers 2 software levels to create, edit and import embroidery designs. The first level is Customizer 11000 which is a userfriendly and simpler version. Digitizer Pro is the professional level that offers industrialquality features and techniques. The JEF file format is a native format that is used by Jerome sewing program, Format Foundry and Embrid Suite.
Description 2: .JEF file extension is linked with Janome Embroidery Format. This file is utilized by the embroidery format for Janome sewing machines. It carries the stitching patterns and sewing instructions for making embroideries. It is a native format used by Janome sewing software, but it is also recognized by Format Foundry and Embird Suite.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Embird Suite, Janome Customizer and Digitizer, Threadsmith Format Foundry
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