Since the extension is .mkv (Matroska Video), the file is a container. Unlike .mp4 , MKVs are popular for high-quality "deep" releases because they support:
: Navigation points similar to a DVD/Blu-ray menu. 7d5b17e185069e5c77b4c945e4fa29b5.mkv
The filename appears to be a unique identifier, likely an MD5 hash used by file-sharing networks, automated downloaders (like Usenet or private trackers), or specific internal databases to mask the actual title of a video file . Since the extension is
