yeh it is pretty good, I know how it works and i think i remember the .png file not being the actual file but more as a cover. i cant exactly remember but I found it out when using a hex editor in trying to hack into the music and use your own music in spore
nearly worked but then i got stuck and my freind helped me, which he successfully got it working but didnt tell me how and didnt save anything >_> ... so i need him to come over and do it again - then tones of people can be happy using their own music in spore