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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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JSM - Extension Details
Date Added: January 01, 1970
File Extension:  .JSM
Description 1: .JSM file extension is linked with Jaws Script Message File. This is the file extension for the script file utilized by Jaws an interactive talking installation with enhanced multilingual program. Languages it supports are: American English, British English, Latin American Spanish, Castilian Spanish, French Canadian, French, German, Brazilian Portugese, Italian and Finnish. Features include: unique scripting language, easytouse without the need for assistance, latest tools for customization, supports all Windows applications, and many more. .JSM file extension and Jaws are owned and developed by Freedom Scientific Inc.
Description 2: .JSM file extension is linked with Mozilla Firefox Module File. This is the file extension utilized by Firefox module files. Firefox is a free web browser which comes from the Mozilla Application Suite. As of June 2008, Firefox had 19.03% of the recorded usage share of web browsers, which makes it secondmost popular web browser in the entire world. Its key features are: uses free Gecko engine, tabbed browsing, spellchecker, incremental find, download manager, live bookmarking and integrated search system.
Description 3: .JSM file extension is linked with Jigsaws Galore Jigsaw File. This is the file extension for the jigsaw file utilized by Jigsaws Galore is a computer game that lets players play, create and email jigsaws from 4 to 64,000 puzzle pieces. Features include: authentic and classical piece shapes, and other extra shapes as options; customization of puzzle pieces, from size, shape, thickness, texture; automatic sort and arrange by similar shape and color; includes cheat modules, sounds, background music, screensaver, and more. Jigsaws Galore is owned and developed by Gray Design Associates.
Description 4: .JSM file extension is linked with Jig ShapeMap File. This is the file extension for the shapemap file utilized by Jig a fast, extensible and open generalpurpose renderer for post production facilities and special effects companies. It is a comprehensive tool for rendering traditional geometry, and photoreastic hair, particles and volumes. Jig can perform well on the even the modest of workstations to large rendering clusters, thanks to its scalable design. Jig is owned and developed by Steamboat Software.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Jig
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