[quote quote=520376]
Is there any other way? (That does not go against the community rules of course)[/quote]

You can use C3 CON Tools.

Select the Phase Shift converter. This will convert an encrypted mogg audio file into a single-track audio file. You can ignore the rest of the generated files.

You can then us Magma to open the CON, replace the mogg with the single-track audio and re-build the CON.

I am not sure but you might also replace the audio directly using C3 CON Tools.