The XNA Framework Redistributable provides the necessary runtime components to execute a game on Windows that was developed using Microsoft XNA Game Studio 4.0. This release contains improved functionality as well as new features. Installation of this runtime is unnecessary on systems with Microsoft XNA Game Studio 4.0 already installed. The Microsoft Software License Terms for Microsoft XNA Game Studio 4.0 covers the terms under which developers may use the Redistributable. For full details, review the Microsoft XNA Game Studio 4.0 license terms.