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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
P12 - Extension Details
Date Added: January 01, 1970
File Extension:  .P12
Description 1: File extension .P12 is associated with the PFX (Personal Information Exchange) file. It is attached to security files requiring a password to open. P12 files store secure certificates that are used in authenticating persons or devices like a web server or computer. To install .P12 files, rightclick the file and select "Install PFX.
File Type:   Encoded and Encrypted file
Mode: ASCII
Program(s) to Open:  Associated application: Microsoft Certificate Lifecycle Manager from Microsoft Corporation
Common:
Extension: