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:
You can check the hash against security databases like VirusTotal or Cisco Talos to see if it is recognized as a known safe file or a piece of malware. 90eac71c5649883967e5a706b937f58c.mkv
The format is a container that can hold multiple video, audio, and subtitle tracks. If you need to view the file on
VLC Media Player is the most reliable tool for playing MKV files as it supports almost all internal codecs. The string appears to be a unique filename
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.
Talos File Reputation Lookup || Cisco Talos Intelligence Group
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: