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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
Z04 - Extension Details
Date Added: March 12, 2008
File Extension:  .Z04
Description 1: Part 4 of a split archive that is created using WinZip file compression software bears the .Z04 extension. .ZIP and .Z04 files use the same compression, but the latter needs to be decompressed along with other related split archives. .Z01, .Z02 and .Z03 extensions precede the .Z04 file, and may be followed by other files if the split archive exceeds four parts. Successful archive decompression requires that all files be available.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: WinZip 12 Pro
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