PHO — что за формат? Чем открыть файл с расширением PHO?

File created by printed circuit board (PCB) design applications; contains a photoplot, which is a generated image of a PCB design that can be used in the process of manufacturing PCBs; often generated from a .GBR file and can be viewed in several Gerber compatible applications.

Какой программой открыть?

Altium Designer Artwork Conversion GBR2DXF GraphiCode GC-Prevue
PentaLogix ViewMate
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