How can I convert the VCD audio to a CD Audio or a wav file?
Use virtualdub and open the .dat file, you find the .dat file in the folder MPEGAV on the VCD disc, and select under Audio->Full processing and then File-Save Wav and you will get a WAV from your VCD. Read more here how to use virtualdub. Last burn the WAV file with any audio burning tool and you have an Audio CD of the VCD.