Thanks to gn0me and ZakChaos moaning about it being too big (it’s taking every fibre in my body to avoid the obvious joke), I have managed to get the game to play MP3 files instead of WAV files. This reduced the size from ~200MB to ~40MB, with seemingly no detrimental effects!

Genuine thanks to those guys for getting me to make the change, and also to “Jim Lawless”, who’s program I used to achieve the desired results! No idea who he is, but to give credit where credit’s due - here’s his blog

http://www.mailsend-online.com/blog/a-command-line-mp3-player-for-windows.html