All file extensions
.MKV File
What is it?
MKV (Matroska) is a flexible, open video container that can hold multiple audio tracks, subtitles, and chapters in one file, popular for downloaded movies and TV rips.
How do I open it?
Plays natively in VLC on any platform; Windows Media Player and QuickTime typically don't support it without extra codecs.
Is it safe?
Yes, MKV only contains media data.
Can I delete it?
Safe to delete once no longer needed — these files are often large, so removing ones you've already watched frees up significant space.