Provide game developers with the XNA Framework run-time libraries
Editor: The XNA Framework Redistributable provides the necessary runtime components to execute a game on Windows that was developed using Microsoft XNA Game Studio 3.1. This release contains improved functionality along with new features. Installation of this runtime is not necessary on systems that already have Microsoft XNA Game Studio 3.1 installed.

The End User License Agreement (EULA) for Microsoft XNA Game Studio 3.1 covers the terms under which developers may use the Redistributable. For full Details, please Review the Microsoft XNA Game Studio 3.1 EULA. you can free download XNA Framework Redistributable 3.1 now.