.XAP File Extension
File Type 1XACT Project
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Project created with the Microsoft Cross-Platform Audio Creation Tool (XACT); saved in a text format and contains the intermediate form of the information produced by XACT; includes complete descriptions of wave banks (.XWB files), sound banks (.XSB files), and global settings (.XGS files).
XAP files can be opened and viewed in a text editor, but they should not be edited manually. Instead, project files should only be modified with XACT.
File Type 2Silverlight Application Package
This file is saved in a zipped format. You can view the contents by unzipping it with a file decompression program.
Application package originally created for Microsoft Silverlight (a Web browser plug-in enabling rich media content) but now also used for Windows Phone 7 mobile applications; includes a .XAML file named AppManifest.xaml and may include .DLL files reference by the software; stored in the .ZIP format.
XAP files are commonly used for distributing Windows Phone 7 applications.