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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
VCF - Extension Details
Date Added: January 01, 1970
File Extension:  .VCF
Description 1: VCF files have to do with the vCard file. The standard format for personal or business contact info storage often has the .VCF extension attached. The data included here are names, addresses, telephone numbers, email addresses and other important details. This format comes in handy when importing and/or exporting contacts from other address books.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Eudora, Palm Desktop, Outlook Express or Microsoft Outlook Macintosh: Apple Address Book (part of Mac OS X), Eudora, Microsoft Entourage, Palm Desktop
Common:
Extension: