To do this you will need to have a MIDI player installed, such as the free NOTATION PLAYER and designate it as your MIDI reader.
Although CyberBass still allows diract access to their MIDI parts, it no longer permits us to download the actual MIDI files, so if you want to read these part files into other software, for example which allow you to hear the parts along with the stave images, you will have to find the MIDI files elsewhere.