Find a software converter able to convert nr3 files to mp4 files.
Old Nero compilations (.nr3 files) were used to create a bundle of files for burning and might actually not contain the audio data, just references to them. In any case, only the original Nero software could have been used for such purpose and no converter for this exists otherwise.
But it might also be that you were searching for n3r to mp4 conversion, which is export of Panasonic recordings.
Updated: July 25, 2023
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open nr3 file, Open mp4 file
NR3
Files with nr3 file extension can be found as old CD compilation of MP3 music saved in Nero programs.
MP4
An mp4 file extension is typically used for MPEG-4 multimedia files defined by ISO 14496-1 standard. Commonly used for video and movie files and supported by vast number of media players.
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