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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
Z - Extension Details
Date Added: January 01, 1970
File Extension:  .Z
Description 1: .Z is the extension linked to the compression format used when compressing or "packing files on Unix servers to save on precious disk space. The format features a simple compression algorithm, something that has been largely replaced by the GNUzip compression that creates .GZ files. Users can decompress these files on Unix machines. Just type "uncompress filename "filename here refers to the name of the file the user wishes to decompress.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: Corel WinZip, WinRAR, Smith Micro Stuffit Deluxe Macintosh: Smith Micro Stuffit Expander Unix: unpack, uncompress, gnuzip, zcat
Common:
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