All XLS Padlock Options > Security > Restrictions > Do not allow other instances of Excel when opening the protected workbook
The "Do not allow other instances of Excel when opening the protected workbook" option will check whether Excel is already running when the end user starts the compiled workbook. If this is the case, a message asking the user to close Excel is displayed.
Thus, this ensures the first running instance of Excel is the one associated to the protected workbook.
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