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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
YBTXT - Extension Details
Date Added: May 03, 2009
File Extension:  .YBTXT
Description 1: .YBTXT is the extension tied to the yBook Text File. It is an ebook reader tasked with loading web pages (also includes direct from the Net address) and text files. They are then reformatted into paperbacks to allow for screen reading. This file format also features a printout routine for generating hard copy and booklets for binding, along with a compiler for generating users own ebooks for distribution. yBook registered the .YBTXT extension to avoid any confusion with .TXT files, that may be otherwise listed or registered on a users computer operating system.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Open with yBook Text File program
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