If you are looking for the original source or high-quality versions of these recordings, the following official releases are available:
: A collection from the Richard Itter archive featuring live performances from 1956.
Since the file you mentioned is part of a split archive (indicated by ".part3"), you would typically need (Part 1, Part 2, and Part 3) in the same folder to successfully extract the music files using software like WinRAR or 7-Zip.
: Features "live" performances from 1956, praised for spot-on intonation and historical significance.
Based on catalog data, this archive likely contains a digitized version of one of the following major collections:
: The classic 1964 recordings with the Bath Festival Orchestra, often sought after for their warm analog sound.
: The most comprehensive collection of his Mozart interpretations, covering all major concertos.