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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
SEED - Extension Details
Date Added: January 01, 1970
File Extension:  .SEED
Description 1: File extension .SEED is tied to Linux Preseed File. It is an installer file that comes as part of Linux OS disks, like an Ubuntu Linux installation CD. SEED files are saved in text format consisting of four fields per line. Every line contains the name of the application program that should run or launch the command, as well as the variables type, value and name. "cli.seed and "ubuntu.seed are examples of two common preseed filenames.
File Type:   Executable file
Mode: Binary
Program(s) to Open:  Linux: Linux LiveCD Installer
Common:
Extension: