It is a simple HTTP .mp3 stream.
Code:
http://download.od.tv-radio.com/francemusique/secure/token/7c98054f99dffd8ba25c109ca047c64d/4c567bb1/chansons-dt/chansons-dt_20100730-128k.mp3
I didn't have any problem recording it with
WMrecorder and
Replay Media Catcher.
If the URL of the stream is not detected, close the web-page with the radio stream, clean the cache of your web-browser and try again.