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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:
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UPK - Extension Details
Date Added: January 01, 1970
File Extension:  .UPK
Description 1: .UPK is the extension associated with MassEffect Game File Archive. It is the users mission as SS Normandy Commander Shepard, to take his elite recon squad across a tumultuous galaxy. The goal is to put a stop to the return of a merciless enemy. The Mass Effect program lets users create their own customizable Commander Shepard versions. There is also an option to simply jump in and utilize the precreated Commander character.
File Type:   Archive file
Mode: Binary
Program(s) to Open:  Open with Mass Effect Game File Archive program from EA International (Studio and Publishing) Ltd.
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