There should be two WAV files once you save the project. The original DAW Mode Render and another WAV file saved with the project name. The two files contain the same audio but the saved wav is larger in size than the rendered file. It's the file that BIAB will open and load when you open the project after it's saved.

I assume that's due to BIAB saving APF information into the file. Artist Performance Files are unique to BIAB and allow users to do many tasks with audio on any BIAB Mixer Track. It makes it possible for audio to be loaded onto any of the original seven Legacy Tracks.

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BIAB Ultra Pak+ 2024:RB 2024, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.