When WAV-PRG starts, this window is shown.

Main window

First, choose if you want to create a Commodore 64 tape from an emulator file or an emulator file from a Commodore 64 tape. Then press OK.
About gives you info about the program, and the status of the files necessary to create/read WAV files or sounds. In any case, conversion from/to TAP files is available.

To quit, press the button on upper right corner.