If the extension is suspected to be fake, use a file identifier like CheckFileType.com to verify the "magic bytes" in the header match the .mkv format. 2. Playback and Technical Analysis
If you need to view the file on a device that doesn't support MKV (like some smart TVs or older mobile devices), you can convert it: 90eac71c5649883967e5a706b937f58c.mkv
Since the filename is a hash, it is often used by automated systems or private archives. You can verify what the file actually is using these methods: If the extension is suspected to be fake,
The format is a container that can hold multiple video, audio, and subtitle tracks. You can verify what the file actually is
The string appears to be a unique filename where the name is an MD5 hash (90eac71c5649883967e5a706b937f58c) and the extension is .mkv , a Matroska video container.