"Can not open movie" problem

Whenever I try to start playing a song, it says that the movie file can not open. Everything else is working. There is also no preview when I select the song. Is there a solution to this? All of my songs have the video files in them and are located in the individual folders for each song under the "song" folder in the score folder. (I apologize if I worded this badly, hopefully it makes sense.)

https://codecguide.com/download_kl.htm