Because MKV is an advanced container format, some default operating system players (like standard Windows Media Player versions) may require external codec packs to play them correctly. To ensure smooth playback with full subtitle and audio track support, use these dedicated media players:
For Windows users looking for a lightweight option, MPC-HC is an excellent choice. It uses minimal system resources, making it ideal for older PCs or laptops trying to conserve battery life during long movie marathons. mkv 720p movies list link