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I get an error when I save the sample simdemo.opf project
I get an error save the sample simdemo.opf project using the same filename in the default install location.
The simdemo.opf project that comes with TOP Server V5 and by default is installed at \Program Files\Software Toolbox\TOP Server 5\Projects\ is marked read-only so that you will always have a copy of it you can refer back to.
You should use File ⇒ Save As from the TOP Server menu and save the project under a different file name.