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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
KOA - Extension Details
Date Added: January 01, 1970
File Extension:  .KOA
Description 1: .KOA file extension is linked with Koala paint C64 format a simple image format for Koala Painter Commodore 64 Version. .KOA file extension is also associated with NERO from Nero AG considered the bestselling multimedia suite that offers easy to manage and organize multimedia files, create and edit digital content, as well as userfriendly tools for creating fun and enjoyable projects.
File Type:   Bitmap image file
Mode: Binary
Program(s) to Open:  Windows: Koala Paint C64, Nero AG NERO
Common:
Extension: