Files that contain the .nra file extension are most commonly associated with the Nero disc burning software application. The Nero software is an optical disc authoring application. It was initially created by Germany's Nero AG for use within the Microsoft operating environment, however versions are now available for the Linux operating system as well.
The NRA files that are used by this software contain a list of the audio files that have been compiled by the Nero program. The NRA files do not contain any actual audio files. Instead, these files only contain an index or "play list" of the audio files that can be burned to the CD using the associated software application.
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