[WelshPaul]

Ahhh, thanks Dave - that's why. Prior to downloading and copying your roles folder my Userdata/Library folder was empty, so I don't have any of those other .xml files. I've just checked my Fire TV library folder, which is running Isengaard and that's empty too, but playlists sure work on that. So, I'll have to investigate why I don't have those files.

Edit: on my system (Windows 10) all those .xml files are in C:\Program Files (x86)\Kodi\system\library\music.