Nothing logical, I went by nose, I noticed that some Descriptors did not work, and taking as reference the working one or only changed the extensions of reference.
I had only problems with the AIFF Audio file that with the recognition via extension was mistaken for an IFF image, here I solved by taking the descriptor from AROS 68k where was set only the "Mask".
Preparo un video per mostrare i passi rapidi fatti con Dopus4: