Judy,

As someone else commented, I prefer having a standalone program running on my Windows 7 computer for purposes of extracting or converting audio as opposed to using a conversion website. I fine Pazera Free Audio Extractor to be accessible and it should handle your file formats just fine. You can read about it and find a download link at this website:

https://www.pazera-software.com/guide/audio-extractor/

Alan Lemly