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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
BC! - Extension Details
Date Added: January 01, 1970
File Extension:  .BC!
Description 1: .BC! file extension is linked with BitComet Incomplete File. It is the unfinished download which BitComet started [a BitTorrent program]. .BC! file is created when a download starts and changes to the appropriate file type upon completion. BitComet downloads can be resumed if it has been interrupted or stopped, as long as the file stays on a BitTorrent server.
File Type:   Binary File
Mode: Binary
Program(s) to Open:  Windows: BitComet
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