If you prefer not to install a third-party player, you have two main options:
Download the MKV Video Extensions or HEVC Video Extensions from the Microsoft Store. These allow the default "Movies & TV" app to recognize modern MKV encodings. download mkv player for windows 10
KMPlayer comes with internal codecs that support nearly all video formats, including 4K and 8K at 60FPS. It features a built-in equalizer and advanced screen capture tools. Download: Available at KMPlayer.com . MPC-HC (Media Player Classic - Home Cinema) Best for: Low-spec PCs (Lightweight). If you prefer not to install a third-party