WinPlay3 was the first real-time MP3 audio player for PCs running Windows, both 16-bit (Windows 3.1) and 32-bit (Windows 95). Prior to this, audio compressed with MP3 had to be decompressed prior to listening.
Jason has the details in his blog post Don't Click on the Llama:
Thanks to Jordan Eldredge and the Webamp programming community for this new and strange periscope into the 1990s internet past.When I first clicked on the llama on The Swiss Family Robinson on my Ubuntu desktop the sound ceased. It turns out that the codec selection mechanism is different between the regular player and WinAmp, and it needed a codec I didn't have installed. The fix was:
sudo apt install ubuntu-restricted-extras