Where_the_crawdads_sing_2022_720p_hevc_bluray_org.mkv | [@rafaj_moviess]

: .mkv files can hold many subtitle tracks. You can toggle these on/off or change languages without needing extra files.

: Since the filename says ORG (Original), it likely contains multiple audio tracks. You can switch between them in your player settings (often labeled "Audio" or "Stream").

Since that filename refers to a specific digital movie file, "useful features" usually depend on the you are using to watch it.