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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
BCI - Extension Details
Date Added: June 11, 2008
File Extension:  .BCI
Description 1: .BCI file extension is linked with Belarc Advisor Computer Profile Report. This is the file extension for the computer profile report generated by Belarc Advisor a free personal computer auditing program that builds detailed profile of a computer. It analyzes both hardware and software that have been installed, missing Microsoft hotfixes, CIS, antivirus status, benchmarks, and it displays the results in the users web browser. All userinfo is kept private in the users PC and this program adheres in its privacy policy. Belarc Advisor is owned and developed by Belarc Inc.
Description 2: .BC! file extension is linked with BitComet Incomplete File. This is the unfinished download which BitComet started. BitComet is a BitTorrent program. .BC! files are created when a download process starts, and these files change to the correct file type once the download is complete. Downloads using BitComet can be resumed in case of interruptions or stop, as long as the file is still available on the BitTorrent server.
File Type:   Binary File
Mode: Binary
Program(s) to Open:  Windows: BitComet
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