The File Extensions Database

.OPJ File Extension

  • Developer by: OriginLab
  • Category: Data Files

What is an .OPJ file?

.OPJ is 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.

OPJ file open in OriginLab Origin 2018

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.

Programs that open Origin Project
OriginLab Origin
OriginLab Origin Viewer
OriginLab Origin Viewer
File Type 2 OrCAD Project File
Developer by: Cadence Design Systems Category: CAD Files Format: Text

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.

Programs that open OrCAD Project File
Cadence OrCAD PCB Designer

How to solve problems with OPJ files

  • Associate the OPJ file extension with the correct application. On :
    Windows: Right click on any OPJ file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.OPJ files". Mac: Right click (or Ctrl-click) the OPJ file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .OPJ is Origin Project. Because only the current version supports the latest OPJ file format. Search, therefore, e.g. on the OriginLab manufacturer website after an available .OPJ is Origin Project update.
  • To make sure that your OPJ file is not corrupted or virus-infected, get the file again and scan it with antivirus software.