E72 recorder: audio file MP4??

Today I recorded some  economy lessons with my E72. I chose "High Quality" in the options and started.
When went to listen to them, back home, the recorder couldn't find them in the card!! I was sure ti have recorded them correctly.  And I remember I could see and play previous recordings made in medium quality .
So explored the card with the office file explorer and I found them as "videoclips" ??!! And, in actual fact, clicking on them the real player opened and I could listen to them. Then, I explored the files via PC Suite and realized the medium quality have the WAV extension, the HIGH Q have the MP4 extension. Then, I made the experiment of renaming all of them with the MP3 extensione ..and  finally  the recorder could see and play all of them, MID Q and HI Q
So, why the phone doesn't give always the MP3 extension to the recorded files? To me they should simply be MP3 files sampled at diferent rates, but always MP3...or not?

You're question is quite interesting that I decided to test out the Recorder application too using the various settings.
Indeed, when settings is "Standard", it uses:
Format: audio/wav
Bitrate: 128 kbit/s
Sampling rate: 8000Hz
roughly 5-second sample clip's file size: ~ 85 kb
setting is "MMS-compatible"
Format: audio/amr
Bitrate: 12 kbit/s
Sampling rate: 8000 Hz
roughly 5-second sample clip's file size: ~ 8 kb
setting is "High"
Format: audio/mp4
*Bitrate: 64 kbit/s
*Sampling rate: 48000 Hz
roughly 5-second sample clip's file size: ~ 43 kb
*I got this info after downloading the sample .mp4 I recorded to the PC
(for the WAV and AMR, those info are shown using the phone's Clip Details)
The 5-second is not exact (I just recorded my voice saying the same words approx for 5 seconds).
~~~~~~
puasho:
AMR is different from WAV which is different from MP4.
Even when you rename the MP4 to MP3, it won't become an MP3 file (though sometimes it fools the PC's player to force playing the sound file (sometimes, it may know how to play a certain file format but didn't recognize the file extension)

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