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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
BCM - Extension Details
Date Added: January 01, 1970
File Extension:  .BCM
Description 1: .BCM file extension is linked with Business Contact Manager. This is the file extension for the business contact manager utilized by MS Office Outlook. .BCM files store data such as accounts, projects, business contacts and others. MS Office Outlook is an email application and a personal information manager rolled into one. It also has other nifty features such as a calendar, contact and task managers, web browsing, journal and note taking.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Outlook
Common:
Extension: