Using drag and drop or the File Explorer/macOS Finder, you can select files that you want to open in WaveLab prior to starting the application.
Do one of the following:
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Select one or several files in your system. Right-click it/them, and choose Open with. Select WaveLab.
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Drag one or several files onto the WaveLab icon on your desktop.
Result
WaveLab is started, and the file is/the files are opened in the application.