Cowon S9 and .m4a

[-Stefan-]

Hello!

I consider buying a new pmp and the choice is between the S9 and the Samsung P3.

Since I have some m4a-Files (iTunes Plus, so no DRM), it's important to me that I can listen to them. However, aac isn't listened among the supported files of the S9. That would be the killing argument against the S9.
Is it true that the S9 can't play m4a-files?

Regards,
Stefan

(Sorry if this topic has been brought up before, of course I searched but the search funktion tells me that aac and m4a are too short terms to be searched for).