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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
OCEN - Extension Details
Date Added: January 01, 1970
File Extension:  .OCEN
Description 1: File extension .OCEN is associated with the EdGCM Project for developing and distributing researchquality Global Climate Models (GCM) that feature a userfriendly interface that can run on desktop PCs. EdGCMs core climate model was developed at the NASA Goddard Institute for Space Studies (GISS) and is the GISS Model IIs (shown in Hansen et al., 1983) updated version.
File Type:   Database file
Mode: Binary
Program(s) to Open:  Open with EdGCM Data File program
Common:
Extension: