Sony NW-E393 Help Manual page 168

(*1)
Sampling frequency may not correspond to all encoders.
(*2)
Copyright protected WMA files cannot be played back.
(*3)
Copyright protected AAC-LC files cannot be played back.
(*4)
Non-standard bit rates or non-guaranteed bit rates are included depending on the sampling frequency.
(*5)
Some photo files cannot be played back, depending on their file formats.
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