There are 2 file types use the .OPJ file extension:
1. Origin Project
An OPJ file is a project created by Origin, a data analysis and graphing application used by various scientists and engineers. It contains all of the project contents, which includes data, 2D/3D graphs, and settings.
Updated: October 30, 2017
2. OrCAD Project File
CAD project file created by OrCAD, a program used for designing electric circuits, known as PCBs (printed circuit boards); saves references to files included in the project as well as project settings; usually references at least a .DSN design file; used for storing PCB design information together.
OPJ files are saved in a plain text format, but should only be modified using the OrCAD user interface instead of a text editor.
|Cadence OrCAD PCB Designer||Free Trial|
Updated: August 15, 2016