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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
YZ1 - Extension Details
Date Added: June 02, 2009
File Extension:  .YZ1
Description 1: .YZ1 refers to the file extension for a compressed file archive. It is associated with the DeepFreezer and IZArc applications. Use DeepFreezer to create compact archives of Log or document files. DeepFreezer combines great speed with high compression rates. IZArc is an archive utility freeware that supports most archive formats. This program offers support for many encoded and compressed files, access to various powerful tools and features.
File Type:   Archive and Compressed file
Mode: Binary
Program(s) to Open:  Associated applications: DeepFreezer from BinaryTechnology and IZArc from Ivan Zahariev
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