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XNA Game Studio 4.0 Refresh is a programming environment that allows you to use Visual Studio to create games for Windows Phone, Xbox 360, and Windows. XNA Game Studio includes the XNA Framework, a set of managed libraries designed for game development based on the Microsoft .NET Framework. This documentation collection contains technology overviews, tutorials, and reference material related to XNA Game Studio.

Features:

* Avatar Support: Render and animate Avatars to use in your game to represent gamers and other characters within your game.
* Xbox LIVE Party Support: Enabling gamers to communicate, even when each gamer is not playing the same game in the same multiplayer session. LIVE Party supports up to an eight-way group voice chat for gamers and keeps gamers connected before, during, and after a gameplay session, persisting across title switches.
* Video Playback: XNA Game Studio now supports the ability to play back video that can be used for such purposes as opening splash and logo scenes, cut scenes, or in-game video displays. This set of XNA Framework APIs supports the following features:
o Full screen video playback
o Video playback to simple textures in game
o Control of playback such as pause/resume and stop
o Retrieve properties of the video, such as playback time, size, and frame rate
o Determine the type and usage of the audio track, such as if it has music, dialog, or music and dialog
o Play back multiple video streams at the same time
* Audio API: 3.1 has a new usage pattern of SoundEffect.Play. Sound instances created by Play calls are disposed automatically when playback ends, and SoundEffect.Play returns a Boolean to indicate success or failure.
* Content Pipeline Enhancements: improvements making it much easier to add custom types (custom attributes for run-time of an object and run-time type version of an object, and the ability to determine if deserialization into an existing object is possible).
* XACT3 Support: includes support for XACT3 with new features including the ability to enable a filter on every track, and support for the xWMA compression format.
* Visual Studio Changes: XNA Game Studio 3.1 supports both 3.0 and 3.1 projects, and it includes support for upgrading projects from 3.0 to 3.1.