The File Extensions Database

.OPJU File Extension

  • Developer by: OriginLab
  • Category: Data Files

What is an .OPJU file?

.OPJU is Origin Unicode Project

An OPJU file is a project created by Origin 2018 and later, a data analysis and graphing application used by various scientists and engineers. It contains all child windows in the project, which may include worksheets, 2D/3D graphs, and matrices. OPJU files also store project variables, imported filters, results log contents, and metadata.

OPJU file open in OriginLab Origin

OPJU files replaced .OPJ files, which were the primary files used to save projects in all Origin versions before the 2018 version. OPJU files are saved in a unicode format which features performance advantages over the older OPJ file format.

You can open OPJU files with Origin and Origin Viewer. Origin is the primary program used to create, open, and edit OPJU files but Origin Viewer is also commonly used since it is a free, lightweight program that allows you to view and copy information in OPJU projects in Windows and macOS.

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

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

Programs that open Origin Unicode Project
OriginLab Origin
OriginLab Origin Viewer
OriginLab Origin Viewer

How to solve problems with OPJU files

  • Associate the OPJU file extension with the correct application. On :
    Windows: Right click on any OPJU file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.OPJU files". Mac: Right click (or Ctrl-click) the OPJU 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 .OPJU is Origin Unicode Project. Because only the current version supports the latest OPJU file format. Search, therefore, e.g. on the OriginLab manufacturer website after an available .OPJU is Origin Unicode Project update.
  • To make sure that your OPJU file is not corrupted or virus-infected, get the file again and scan it with antivirus software.