If you are referring to a specific video file you've encountered elsewhere:

The most "interesting piece" regarding this topic is the card's legacy as the that somehow became a massive commercial success. The Legend of the SiS 6326

It featured a strong MPEG II decoder for its time, making it a decent budget choice for playing DVDs even if it couldn't handle high-end games.

Some search results link "B6326" to documentation for the A46 Newark Bypass project in the UK, where it serves as a location or reference code.

Despite being a "speed monster" in reverse, it sold over 7 million units in 1998. Its success came from being dirt cheap and integrated into countless office motherboards where 3D gaming wasn't the priority.

Released by Silicon Integrated Systems (SiS) in June 1997, the 6326 chip was widely mocked for its abysmal 3D performance compared to competitors like 3dfx or Nvidia.