File extension opj is used by following file type(s):

File extension opj file type 1 description:
OmniPage schedule file

File extension is used by OmniPage. Schedule file.

Programs
that open opj files:
OmniPage (multiplatform software)

 

File extension opj file type 2 description:
OrCAD capture project file

The OPJ file extension is associated with OrCAD PCB Designer.

The .opj files contain captured PCB projects. A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, or traces, etched from copper sheets laminated onto a non-conductive substrate. It is also referred to as printed wiring board (PWB) or etched wiring board. A PCB populated with electronic components is a printed circuit assembly (PCA), also known as a printed circuit board assembly (PCBA).

Programs
that open opj files:
OrCAD PCB Designer (Microsoft Windows)

 

File extension opj file type 3 description:
Origin project file

File extension is used by Origin. Project file.

Programs
that open opj files:
Origin (Microsoft Windows)