For my curiosity, I have downloaded ABCExplorer 1.6.1. I couldn't get that to run properly on wine (I'm on Linux) but I have ran the versions of abcm2ps (5.9.25 - November 2011) and abc2midi (3.10 - June 2013) it comes with. There are a few warnings but the output from the diadem example I gave seems OK with both of these when ran from the command line.