While .mkv files are generally safe, always run a scan using VirusTotal or your local antivirus if the site prompts you to download an .exe or .zip instead of the intended video file.
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This is a Matroska Video container. It is preferred for high-definition content because it can hold multiple audio tracks, subtitle streams, and chapters within a single file. While .mkv files are generally safe
Files are generally kept active as long as they receive regular traffic, though inactive files are eventually purged. Technical Breakdown of the File Download 5p4wn.Du47350E5.mkv @ UppIT