This is a "Matroska" video container. MKV files are popular because they can hold multiple audio tracks (like Hindi and English) and subtitle files within a single download. Why Avoid Sites Like Filmywap or Filmy4wap?
While sites like often appear in search results for movie downloads, they come with significant risks: This is a "Matroska" video container
You can rent or buy the movie on Amazon Prime Video, Apple TV (iTunes), Google Play Movies, and Vudu . Apple TV (iTunes)
For the highest possible bitrate, the 4K Ultra HD and Blu-ray discs offer a superior experience compared to any compressed MKV file found online. Conclusion Google Play Movies