Last Update: 1/5/2023
Origin 2018 introduced a new Unicode-compliant (UTF-8) project file type -- the OPJU file. These files cannot be opened in earlier versions of Origin (though, it should be noted that Origin 2018 through Origin 2022b retain the ability to save files in the older OPJ format). New features in Origin 2023 and later require the OPJU format and therefore cannot save as OPJ.
If you cannot open an OPJU file with your Origin software, do this:
For more information on the Origin Viewer, visit this page on the OriginLab website.
Keywords:backward-compatible, file type, project file