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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:
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BAS - Extension Details
Date Added: August 01, 2009
File Extension:  .BAS
Description 1: .BAS file extension is linked with BASIC Source Code File. This is the program source code which is written in BASIC programming language. BASIC is the acronym for Beginners Allpurpose Symbolic Instruction Code which is available in different versions that have been modified since its inception in the 1960s. The standard format of .BAS is supported by various programs and it opens directly.
File Type:   Program Executable File
Mode: Binary
Program(s) to Open:  Windows: BBC BASIC, Blitz BASIC, FreeBasic, Microsoft Visual Basic, PowerBASIC; Mac: REALbasic
Common:
Extension: