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September 28, 2015 at 5:52 am
#25434
Do you mean you are using the latest version of “Optisystem”? If you are using version 13.0.3 (the same as I do), then you should be able to open the file. Could you check your version by chooseing “about OptiSystem” option on “help” tab in menu bar and verify if you are using the same version?