OPJ FilesOGW FilesThemes, File TypesOGM FilesOGG FilesOGS FilesTemplates, File TypesOTW FilesOTP FilesOTM FilesOIF FilesImporting, Filter Files (OIF)
A series of Unicode-compliant (UTF-8) file types was added for Origin 2018. Upgrade users may recognize that some of the old familiar file types now have a Unicode counterpart, denoted by an appended 'u' (e.g. *.opj => *.opju). Origin versions 2018 and later will read and write the older, non-Unicode file types. As the default is to save to the newer Unicode-type files, be sure to set the Save as type drop-down if you need to save to an older file type.
File Types, Origin