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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
TBK - Extension Details
Date Added: January 01, 1970
File Extension:  .TBK
Description 1: The .TBK file extension comes from ToolBook File. SumTotal Systems ToolBook created the .TBK project file. Click2learn is the previous developer of the TBK file. A .TBK file can be used to create a variety of interactive elearning content. Examples of such content include online quizzes, skills training and software program simulations.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: SumTotal Systems ToolBook Instructor or ToolBook Assistant
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