mediaguru

Try changing the suffix to .mp4 or .aac - let me know if that works. I work for a different Japanese company and they put AAC playback into one of their devices (a phone). It took me a lot of effort to convince them to recognize .m4a as an AAC suffix but eventually they did, thank goodness. The whole point to support AAC is to get unprotected iTunes support! Sounds like Sony forgot that but hopefully, it can be fixed.