I am awaiting a reply from the moderators. However, although I use Windows 7 I have checked out Windows 10 Voice Recorder and it has a few limitations which cannot be altered. It Saves your incoming Audio as an Mp4A Audio file, which is compressed to reduce file size but LOSES sound quality as it does so. Although technically those files can be Converted to ANY other file format, they cannot IMPROVE the Quality that has been lost already by Windows 10.
Possible workarounds.
Download Audacity for FREE. It does many things just like a Paint program but you will never use 90% of those features. It is simplicity itself to RECORD your tapes into a MONO-Track in Audacity and Save them as WAV files, unaltered, just as the sound left your cassette player but with some added hiss, rumble and whatever, but that can all be removed. If you choose that method I can process them through Audacity or even give you instructions for DIY. It is not difficult if you follow the steps.
The reason for not recording or converting your original tapes is that they will already not be of Studio Audio quality originally and any Conversion will lose data and worsen the End Result.
A poor 2nd is to record from the cassette player speakers into a mobile phone which can then send the files to a computer by any means.
Any WAV file can be Improved using just 5 features in Audacity and Saved again in almost any Format you like.
Hope this helps.
https://www.audacityteam.org/download/