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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
BDM - Extension Details
Date Added: August 03, 2009
File Extension:  .BDM
Description 1: .BDM file extension is linked with Blaise Related File. Blaise is a computerassisted interviewing system [CAI] and survey processing application for Windows OS. This application is designed for official statistics and is being developed by Statistics Netherlands. It is available to research institutes such as the National Statistical Institutes, and it is best to contact the developer if you are eligible to acquire a license for Blaise.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Blaise
Common:
Extension: