When you try to do a "Plain Excel XLS File" report, it fails with the error "Unable to generate report. Invalid data source."
You can also get a similar response when you try to use the print wizard on the Historical Data Viewer.
It appears this is being caused by changes to the Microsoft JET drivers in an October update. The new JET drivers can be found here for 2010 -
And here for 2016 -
Download and install the JET drivers and then, in the main VTScada installation folder, find the file called Excel.dsn and modify the EXCEL.DSN for the following fields as shown...
DRIVER=Microsoft Excel Driver (.xls, .xlsx, .xlsm, .xlsb)
We cannot distribute the JET files ourselves so we are limited in how to correct this.
If you need to do this, please let us know if it works or not. Email us at firstname.lastname@example.org with the VTScada version and the Excel/Office version you are using.