错误“应用内购买存档...无效。该软件包在'Contents / xyz.m4a'中包含一个可执行文件“

I am creating a .pkg file for a couple of game levels using iOS 6 and Xcode 4.5.2. When validating the Xcode .pkg for the IAP content, it complained about m4a audio files that I have in the package for sound. The strange thing is that it says: "The archive for In-App Purchase ... is invalid. The package contains an executable at 'Contents/xyz.m4a'." I know that I have some audio files in the package (with extension .m4a) but I don't understand why it's referring to those as 'executable".I am creating a .pkg file for a couple of game