QNAP have provided the Video Station can support MKV file. moreover, in file manager can share to VLC, should support MKV file. More details you can access the link below : www.qnap.com/zh-tw/how-to/tutorial/article/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8-video-station-%E7%AE%A1%E7%90%86%E5%BD%B1%E7%89%87/