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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
W32 - Extension Details
Date Added: February 09, 2008
File Extension:  .W32
Description 1: .W32 is the file extension linked to Win32 files. Sysmedia WinCAPs subtitle preparation program software makes use of the native subtitle file format. These files store time codes and subtitle info; along with other settings. The W32 file extension is handy for adding closed captions and subtitles to both live and recorded video streams.
File Type:   Video file
Mode: Binary
Program(s) to Open:  Windows: Sysmedia WinCAPs
Common:
Extension: