Extract audio from video preserving audio quality
If you aren't adverse to using a terminal to extract it, FFmpeg is a very good tool that you can use. The command that you'd want to run in ffmpeg -i [input file name here] -c:a copy -vn -sn [output file name here].

-c:a copy: This argument copies the audio stream of the file.
-vn: This argument informs FFmpeg to not account for any video streams.
-sn: This argument informs FFmpeg to not account for any subtitle streams.

Altogether, this results in a lossless extraction of the audio stream from the video file. If you have some knowledge in making scripts, you could create a script that will perform this action for a set of files so that you don't need to do it manually.