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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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P3T - Extension Details
Date Added: December 10, 2008
File Extension:  .P3T
Description 1: .P3T is an extension referring to a Sony PlayStation 3 video game system theme file. It features layouts, images, sound files, buttons as well as other settings needed for PS3 interface customization. Users can transfer .P3T files onto the PS3 with the help of a USB connection or a Memory Stick. Place them in the directory marked ":/PS3/THEME. If there is no existent THEME folder, create one then move the P3T file.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Windows: P3T Compiler, P3T Unpacker Unix: P3T Unpacker
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