You don't say what you have already tried. For example, have you already 'right clicked' one of the .WAV files and selected Windows Media Player when the drop down menu offers choices to 'Open with'? Set the Windows Media Player as the default application to open your WAV files. (These instructions may be incorrect because I'm writing this from memory. I don't have my W10 laptop with me at the moment.)
If you've already tried this, post again saying what you have tried and give more information about the update you carried out and which operating sytem you are using.
Shall we reboot our cartoons thread again? π