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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
PST - Extension Details
Date Added: January 01, 1970
File Extension:  .PST
Description 1: .PST files are Microsoft Outlook Personal Folder files, which are used to store folders and data from Microsoft Outlook. Emails, contact, calendars, and all other Outlook data is stored in PST files. The default file is outlook.pst.See also .ost for Outlook in combination with Microsoft Exchange Server.
File Type:   Outlook data file
Mode: Binary
Program(s) to Open:  Microsoft Outlook
Common:
Extension: