.OPJ File Extension

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.

The OPJ file is the most common file type associated with Origin since it is used as a container for projects. You can open OPJ files with Origin and you can also open OPJ files with Origin Viewer, a free, lightweight program that allows you to view and copy information in OPJ projects.

To open an OPJ file in Origin, select File → Open..., select the ".opj" file type, navigate to the OPJ file location, and click Open.

To save an OPJ file in Origin, select File → Save project or Save Project As..., name the file, choose the save location, and click Save.

NOTE: The release of Origin 2018 included an updated unicode format for saving projects (.OPJU), which features performance advantages over the older, non-unicode OPJ file format.

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.