There do exist some utilities (mainly German) that can be used to convert special BWM iDrive multimedia files (*.br5, *.br4, *.br3 etc.) to other more common multimedia files like the MP3, MP4 or WMA:
Convert BMW iDrive multimedia data to MPEG-4 video file format.
We have found 3 software records in our database eligible for .br5 to .mp4 file format conversion.
Microsoft Windows software - convert br5 to mp4 on Windows
bmwconv is a command line tool used to convert BMW iDrive multimedia data file to MP4/MP3/WMA audio.
Convert from br5 file
to mp4 file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned br5 to mp4. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
BRx Konverter is a German software used to convert audio files in br3, br4, br5, br25, br27, br28, br29, br31, BR32 and br48 format to more common audio files like MP3, or WMA.
Apple macOS / Mac OS X software - convert br5 to mp4 on OS X
BRx Converter for Mac allows users to convert br3, br4, br5, br25, br27, br28, br29, br31, BR32 and br48 audio files (created with a BMW car navigation system) back into mp3, mp4 and wma and several other audio files.