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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
DYN - Extension Details
Date Added: January 01, 1970
File Extension:  .DYN
Description 1: .DYN file extension is linked with Dyno2000 Engine Simulation File. This is the file extension utilized by Motion Software Inc. such as Dynomation a highlyaccurate program that allows users to peer inside a running engine. It reveals "invisible engine passages [i.e. mass flow and pressure waves in cylinders] via simulation. It accurately displays the power that an engine can produce and why it is made that way. The program also shows users were to apply efforts to optimize their engines performance.
Description 2: .DYN file extension is linked with Lotus 123 File. Lotus 123 is an application from IBM Corporation and it offers the following features: speechenabled SmartMaster templates, enhanced compatibility with MS Excel, @Functions, copydrag and copypaste features, SmartLabels, auto SmartFill, more worksheet rows, detailed answers to queries, excel menu finder, data validation addin, supports Euro currency, autosave and keyboard switching, as well as internet integration capabilities.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: Lotus 123
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