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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
BAY - Extension Details
Date Added: January 01, 1970
File Extension:  .BAY
Description 1: .BAY file extension is linked with Kodak/Roper Bayer Picture Sequence. This is the file extension for picture sequence utilized by Kodak. This file carries specific Kodak picture format which may be utilized by some highspeed video cameras [Kodak HRC1000]. .BAY file extension and Kodak HRC1000 [and other Kodak cameras] are owned and developed by Kodak.
File Type:   Movie, Video & Multimedia File
Mode: Binary
Program(s) to Open:  Windows: Kodak Picture Sequence
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Extension: