Convert WPP to WAV

This is not a conversion in the proper sense, but you can certainly export WavePad Project Files directly to WAVE Audio Files (.wpp to .wav conversion), which is quite simple. You are, however, limited to using the original software.

To our knowledge, there is no currently existing third-party solution for such conversion, which means your best bet is using WavePad itself. This audio editing tool will let you export its WPP projects in numerous audio formats, including WAV.