I have a problem with my NP 3700 device. WAV and MP3 files are stored on a NAT driver (Freebox from french ISP "Free").

The NP 3700 can access and find the directories on this driver (Music, Pictures...) and can play WAV files but when I enter a directory with MP3 files the screen displays "Empty List". The directory contains .mp3 files and the problem is the same with any music file which is not a WAV file (ogg file...).

Does anyone has an answer to this problem ?