A Matroska Video file. This container format is popular because it can hold multiple audio tracks (e.g., Hindi and English) and subtitle tracks in a single file.
At least run a virus scan before opening. Use a reputable player like VLC (not Windows Media Player). Hindi.Medium.1080p.-Vegamovies.NL-.mkv
How streaming platforms (like Prime Video) have countered piracy. To help me write the you need, please clarify: A Matroska Video file