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Below table shows the REQUIREMENT for installation of silverlight for devloper abou devloper tool OPERATING system

This file is used in WPF/SilverLight applications. And the purpose of using this files is given below:-
(1)Its DEFINE global STYLES inside the RESOURCES tag
(2)Its define properties that can then be used for data passing between .xaml pages.
(3)Its define event handlers LIKE Application_Error, Application_Startup wherever needed.
(4)Its provides a startup URI in WPF or specify the startup page in SilverLight applications

What is .XAP file in Silverlight?
XAP is combination of 2 or more files which have .dll,.XAML and some resource files. In real .XAP is a COMPRESSED file for silverlight application. Now comes to the files it contains below is the list for the same:-
(1)AppManifest.xaml
(2)COMPILE ASSEMBLY of silverlight project(.dll) file
(3)Other RESOURCES of silverlight application.
Usualy Visual studio CREATES 2 files while creating project
(i)App.XAML
(ii)Page.xaml

What do you think Silverlight compatible with Multiple browser and operating System
Yes Silverlight will compatible with multiple BROWSERS, devices and operating SYSTEMS. It is free plug-in WHIHC is support by .Net framework.

Silverlight with .NET Framework helps to build and deliver next generation rich interactive applications for both Web and Windows. Silverlight uses the XAML to ease UI development.
Or
We can also say Silverlight is a new cross-browser and cross-platform for implementation of the .NET Framework for building and delivering the next generation of media experiences and Rich Interactive Applications for the web.
Below are some silent features of Silverlight that makes it very popular:-
(1)Its compnents are very light and easy to download and install in seconds once downloads will available next time.
(2)It reads data and updates the display without any interruption the user by refreshing the whole page.
(3)It runs in all popular Web browsers, including Microsoft Internet Explorer, Mozilla Firefox, and Apple Safari, Google CHROME, and on Microsoft Windows and Apple Mac OS X. Becasue it is cross-browser, cross-platform technology.
(4)ONE of its good feature is streaming video and audio. It scales video quality to everything from mobile devices to desktop browsers to 720p HDTV video modes.
(5)Silverlight includes a subset of the WPF technology which greatly extends the elements in the browser for creating UI.
(6)It enables you to create Windows Phone applications.
(7)The application can run in the Web browser or we can configure it so users can run it on their computer without browser.
(8)Silverlight support to many services just like WCF, SOAP, or ASP.NET AJAX services.
(9)Silverlight support many types of data just like XML,JSON,RSS data.
(10)Silverlight can also called a EXTENSION of Javascript.Silverlight provides extensions to the universal browser scripting language that provide control over the browser UI.
(11)Silverlight support protocol like HTTP over TCP.
(12)Silverlight have abilty to integrates with our existing JavaScript and ASP.NET AJAX code wheater it is complex or simple.
(13)Silverlight create immersive graphics, animation, media, and other rich client features, extending browser-based UI beyond what is available with HTML alone.
(14)Built-in codec support for playing VC-1 and WMV video, and MP3 and WMA audio within a browser.
(15)Silverlight makes it easy to build rich video player interactive experiences.
(16)Silverlight enables you to create rich UI and animations, and blend vector graphics with HTML to create COMPELLING CONTENT experiences.

Deep Zoom help us to provides the ability to interactively view high resolution pictures/images in SILVERLIGHT. We can also zoom in and zoom out of pictures/images rapidly without any aafect on PERFORMANCE of our application. Deep Zoom provides smooth in-place zooming and panning.

DeepZoom Composer helps us to allows us to create high resolution pictures/images compositions which are BUILT for smooth zooming and panning. DeepZoom Composer is absolutely free, and is simple to use - just loads in all your high resolution images and makes your COMPOSITION on screen.

Deep Zoom Composer is a tool that allows PREPARING of pictures/images for use with the Deep Zoom feature in Silverlight 3.