File created by PhCNC, a Printed Circuit Board (PCB) prototyping software; contains a PhCNC project, including customized settings like tabs positions and tool tables; holds all information related to the project in a compressed format, which makes the file 4-5 times smaller than the actual volume of files imported into the project.

To create a PHJ file, simply open the PhCNC program and select File → Save As Project..., and choose your save location and file name. You can also select File → New Project and then save it. To import a PHJ file, select File → Import Project... and choose your PHJ file. You can also click on the folder icon with the red "+" on the left pane of the window.