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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
YBK - Extension Details
Date Added: April 09, 2008
File Extension:  .YBK
Description 1: YBK is the file extension associated with electronic books that allow for reading on Pocket PC PDA using the YanCEyWare Reader. These files support graphics, links across ebooks, text, pageviewing history and highlighting. Biblical along with other religious text are commonly stored in YBK format. But other fictional and nonfictional texts can also be saved using the YBK format. To work properly, YBK files need to be stored in the Library directory of SD cards used by a PDA.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Pocket PC: YanCEyWare Reader
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