It brings back lots of memories. There was even a way to pack an MP3 in a .wav file so it could play on Win31 players that didn't have native support for MP3, using Windows' codec instead.
Also, from the same site:
https://www.rarewares.org/rrw/cooledit.php
A program that I remember using back then. It's less than 1 MB, but has most of the features of Audacity today.