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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
B4U - Extension Details
Date Added: May 10, 2008
File Extension:  .B4U
Description 1: .B4U file extension is linked with Before You Know It file. Before You Know It is a unique languagelearning application. It uses a personalized and smart approach. This application offers users the native speaker's experience through seeing and hearing. User's responses are monitored by the program and difficult words or phrases are adjusted to focus unique but challenging words. Before you know it guarantees faster learning with the use of Perfect Recall. .B4U and Before You Know It software are owned and developed by Transparent Language.
Description 2: .B4U file extension is linked with docPointer Visual ReadMe File. docPointer is an application which helps users become more productive. This application offers easier visualization of documents and websites that use graphics and links. ReadMe files are organized and they just dont appear as plain text documents. These files can be displayed via web browser such as Explorer and Firefox. .B4U file extension and docPointer are owned and developed by Tuuka Salonen.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Firefox & Explorer: docPointer
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