Ultimately, you are wanting to use this command line tool: excelcnv.exe
"C:\Program Files (x86)\Microsoft Office\Office15\excelcnv.exe" -oice "C:\in\MyFile.xls" "C:\out\MyFile.xlsx”
If this is a one-time need, just run something like this from your cmd window. Otherwise, you can befriend the Run Command tool or use an Event to run this task.
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