Thanks. I have done what Crossfade suggested and have been able to get music to play on Pictures to Exe. Does that mean I hold two copies of the track in the library, or could I delete the aac version? And should I just make everything mp3 in the first place? Why change back to aac after converting? Another problem, since I downloaded iTunes to Windows (not sure if I needed to do that now), I can't open iTunes on the Mac - says it can't read the library because it was created by a newer version of iTunes. Bit out of my depth here!