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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
IAS - Extension Details
Date Added: August 02, 2009
File Extension:  .IAS
Description 1: IAS file extension is linked with BitDefender File. It is the file extension utilized by BitDefender an antivirus, antispyware and antispam application that is ranked #1 and winner of "Top TenReviews Gold Award. BitDefender is one of the most outstanding PC defense software of 2008. It offers users the following features: userfriendly interface; scans all existing computer files. incomingoutgoing emails, internet/network traffic and IM transfers.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Mac: BitDefender
Common:
Extension: