The problem will thus be solved…. with a forthcoming version of Audacity. And for me the question of the codes and codecs is a little less opaque. (I'm not quite sure of that... )
That said, why preserve this Quick Time filter in the "Type file" choices of opening or importation of file….since QT itself opens only formats approved by Apple, and that these AIFF/ima4 files open by using the filter of the ffmpeg suite.