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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
ZOO - Extension Details
Date Added: August 10, 2008
File Extension:  .ZOO
Description 1: .ZOO is the file extension attached to saved game files Zoo Tycoon creates. Microsoft developed the zoo simulation game Zoo Tycoon. Game progress is stored by .ZOO, allowing players to resume the game at later times. Store .ZOO files within the Zoo Tycoon directory in the folder marked "Saved Games.
Description 2: Files with the .ZOO extension use the old compression format that Unix systems employed It was largely based on the LempelZiv compression algorithm. This format is able to reduce file size by between 20 and 80 percent, depending on the type of file. .ARC compression later replaced the one used for .ZOO files.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: ALTools ALZip, WinAce Macintosh: MacBooz, MacZoo Unix: zoo
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