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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
P7 - Extension Details
Date Added: January 01, 1970
File Extension:  .P7
Description 1: File extension .P7 is linked to the Elemica eSignature application, a program utilizing the .p7s file extension on digital signatures created when signing invoices with the use of the pkcs7 cryptographic message syntax standard. The .P7 file format is in support of the EU Directive 2001/115/EC with regard to electronic invoicing.
File Type:   Encoded and Encrypted file
Mode: ASCII
Program(s) to Open:  Associated application: eSignature from Elemica
Common:
Extension: