How to mute (radically lower the volume of) Win10 OS *.wav file(s)

The malware that is Win10 OS entirely ignores the user's sound volume settings, playing the WAV files instead at ear-popping volumes per OS-triggered events. This is how to fix that.

1. Take ownership of the folder, subfolders and files
   • C:\Windows\Media > Properties > Security > Advanced
     • Owner > Change > Administrators
       • Checkbox @ apply to all objects thereunder.
2. Close the window
3. Reset ACLs of all thereunder
   • C:\Windows\Media > Properties > Security
   • Administrators > Edit > Full ...
4. Adjust volume per file
   • @ PortableApps > Audacity
     • Open > C:\Windows\Media > FNAME.wav
     • Select > All
     • Effects > Amplify
       • -24 (db)
     • Export > WAV (to a temp dir)
5. Copy the modified files back to their origin.