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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
B - Extension Details
Date Added: October 09, 2008
File Extension:  .B
Description 1: .B file extension is linked with BASIC language source file. This programming file contains source code that is written in the BASIC programming language. The program may also contain BASIC program/application or functions that are referenced by some or other BASIC project files. .BAS file extension is also used by BASIC source files. This is a standard file format and it is supported by various programs. The file opens directly and may be referenced by open applications.
File Type:   Source code and script file
Mode: ASCII
Program(s) to Open:  Windows: can be edited with a text editor, FreeBasic, Microsoft Visual Basic, PowerBASIC, PureBasic; Mac: can be edited with a text editor, REAL Software, REALbasic
Common:
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