It depends on how Apple is supporting the DNG.
In the DNG the camera also store the profieles needed to correctly read the RAW, this is not the case with other RAW formats. So that means that IF the program read the profieles inside the DNG then you don't need to have support since everything needed is already inside the file.
You got that, i can explain it easier.
as for the DNG converter, that converts RAW into DNG, since your file is already in DNG that does work but it will not help you with the problem.