It’s a short video clip linked to the Youtube server.
I don’t know why your dictionary app cannot play it, but you can open your browser to directly access the following playlists
#Real Grammar https://www.youtube.com/playlist?list=PLbEWGLATRxw-o8Ag7nPSe5_Lf1NiIDVZm
#Real Vocabulary https://www.youtube.com/playlist?list=PLbEWGLATRxw-yIFC1WWylyRrP2BDlk12i
#Real World English https://www.youtube.com/playlist?list=PLbEWGLATRxw-T5bAT0X1nB3omesfRvTXZ