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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
OB3 - Extension Details
Date Added: January 01, 1970
File Extension:  .OB3
Description 1: .OB3 is the extension tied to Outlook Backup Full Backup file. ABF Outlook Backup is a backup/restore program for the Microsoft Outlook mail client. This type of software makes for fast, easy and secure creation of Outlook data backup copies. Use Outlook Backup in saving and restoring Outlook journal and calendar entries, email messages and folders, notes, mail accounts, junk email lists, RSS feeds, address book contacts, tasks, message rules, notes as well as Internet Explorer favorites. It is also possible to produce backups as selfrestoring .EXE files.
File Type:   Archive file
Mode: Binary
Program(s) to Open:  Associated with ABF Software, Inc.
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