Also I believe as the BPN file is worked on, it will automatically save as a PLN file.
I may be wrong as it is a while since I have done this.
And if you have deleted the BPN file, do you have a recycle bin where you can find it?
I know Windows OS does, not sure about Macs.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10