Check out some options how br3 files might be converted to br4 format.
If any program is capable of converting / exporting / saving .br3 files to .b4 files is the Bryce software from which both originate. It is likely the latest version of the program still supports its previous formats and can somewhat transfer one to another. If not, there is probably no other way how to actually perform br3 to br4 conversion.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open br3 file, Open br4 file
BR3
A br3 file extension is related to the Bryce scene modeling software for Mac and Windows. A br3 file contains 3D scene generated by Bryce.
A br3 file extension is related to the BMW iDrive software. A br3 file stores multimedia data.
BR4
Files with br4 extension can also be found as special type of iDrive multimedia files for media players in BMW cars.
A br4 file extension is related to the Bryce 4 a 3D modeling tool for Microsoft Windows and Mac. A br4 file stores scene data.
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