Just by coincidence, I got recently ( yesterday) into similar problems after reading the post of Captain 777 in another haupwerk sub-forum. Thanks to the Stefanussen answer, I downloaded several midi files. However, I expected to find some info on the chosen registration at least hidden in the MIDI code and I tried unsuccesfully until now to find in the web some code to read in clear a MIDI file to see if such info on registration is included in the MIDI file. In addition to the pleasure to hear pieces played by professionals or so, that I am not, this can be useful to tune the various stops of a given organ.
Michel