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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
XAP - Extension Details
Date Added: June 02, 2009
File Extension:  .XAP
Description 1: The .XAP extension is tied to the Silverlight Application Package. It is the file extension for the application written for the web browser plugin enabling multiple rich media types known as Silverlight. A .XAP file features a .XAML file that is named "AppManifest.xaml along with .DLL files the application references. ZIP compression is used to compress XAP files.
Description 2: .XAP is the extension tied to Silverlight Application Package. It refers to an application written for the web browser plugin enabling multiple media types called Silverlight. The .XAP files include .XAML files that are named "AppManifest.xaml along with .DLL files that the application references. ZIP compression is used to compress XAP files.
File Type:   Executable file
Mode: Binary
Program(s) to Open:  Mac and Windows: web browser with Microsoft Silverlight plugin
Common:
Extension: