PHO files exist as 2 different types. Please find information about each of them below.
Type 1: Gerber Photoplot File
The PHO file extension includes gerber photoplot formats for CAD programs. Most PHO files are used by Gerber Photoplot. PHO file contents can be read by a human. PHO files commonly link to layers lik...
The PHO file extension includes gerber photoplot formats for CAD programs. Most PHO files are used by Gerber Photoplot. PHO file contents can be read by a human. PHO files commonly link to layers like drill, copper, and metal. The following keywords are characteristic of PHO files: %FSLAX35Y35*%, file generated, Gerber (RS-274-X). PHO files range from 9 KB to 550 KB. The median size is 100 KB. The filename art001.pho is common. 60% of PHO files belong to Gerber Photoplot. Gerber Photoplot files can drive aperture vector photoplotters. The format was created by Ucamco for the Windows platform. The specification includes graphical elements like polygons, lines, arcs and text. Control commands provide layer selectors. PHO files contain Postscript text with formatting directions. Formats define graphical PCB elements. Commands provide element control.
Altium Designer
Autodesk EAGLE
KiCad