Windows Media Video 9 is the Microsoft implementation of the VC-1 SMPTE standard. It supports Simple, Main, and Advanced profiles.

In 2006, the Society of Motion Picture and Television Engineers (SMPTE) formally published the Final Specification for SMPTE 421M, also known as VC-1. Formal standardization of VC-1 represents the culmination of years of technical scrutiny by over 75 companies, leading to a codec that is well-documented, extremely stable, easily licensable, and accepted by the industry.

• WM9-Codec - Windows Media Video 9 is the Microsoft implementation of the VC-1 SMPTE standard.
• Windows Media Video 9 Image v2 - The Windows Media Video 9 Image v2 achieves excellent file sizes by not using the normal 25 or 30 frames per second found in most WMV files.
• WMV9 VCM - This Video Compression Manager (VCM) based version of the Windows Media Video 9 encoder/decoder will enable legacy encoding and editing applications to support the Windows Media Video 9 codec in file containers such as AVI.
  

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• If you want to play your codec on Media players, you can have a look at this article - Free Download Codec Pack for Media Player.