I thought Zune was supposed to handle .m4a files? Why is Zune telling me it cannot play the Nine Inch Nails .m4a files? I just downloaded The Slip from NIN's website and downloaded the CD-quality m4a files, expecting both my PC and my ZuneHD to play them. If the Zune software won't play them, I guess that means neither will my ZuneHD. Anyone have any ideas why this is the case? Microsoft even says there is .m4a compatibility.