Microsoft has updated DirectX to version 9.0a. Microsoft DirectX 9.0a End-User Runtime will update your current version of DirectX - the core Windows® technology that drives high-speed multimedia and games on the PC. Read More... The new version is an official release. Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. DirectX 9.0 includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX 9.0 APIs. This release also resolves an issue with DirectX 9.0 where some multiplayer games or MSN Messenger may not work correctly. A number of minor bugs were also resolved. What we know is, that the build number changes from 4.09.00.0900 to 4.09.00.0901. We have posted a file comparison here. Here is the Express Download for the german and english language version.

DX9a Websetup - German
DX9a Websetup - English Source: Microsoft