Many times, subtitles are included inside the video file. Other times, there is a separate file with an extension something like ".srt" . If they are inside the file (as I suspect they are), MC usually does not play them by default. You have to select them. Then, after you select them, MC memorizes your setting and will show subtitles on that file next time. To select subtitles, right click on the video and select from the menu. Or use the up arrow to cycle through the various options and find the subtitles in that set of menus.
Brian.