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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
PC7 - Extension Details
Date Added: January 01, 1970
File Extension:  .PC7
Description 1: File extension .PC7 is tied to PowerCADD 7 Drawing File. It is attached to CAD drawings that the Macintoshonly architecture and design application PowerCADD 7 creates. A .PC7 file often contains 2D drawings, machinery designs, or building designs and layouts. PowerCADD does not always add the .PC7 extension by default, but it is possible for users to put it in themselves.
File Type:   Vector Image file
Mode: Binary
Program(s) to Open:  Macintosh: Engineered Software PowerCADD 7
Common:
Extension: