Fraunhofer Codec? — Music MP3 — DVD MP3 AVI MP4 players codecs conversion help

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I have a new car and the CD player will play MP3 discs but only if they are
burnt with the Fraunhofer codec. Can't find anything via google that will
help me to convert my MP3 files - I think they are Lame codec - CDs or WMA
to Fraunhofer. How do I do this please?

Ian