I want to be able to import data from an Excel worksheet into a FM runtime solution. How do I open a runtime solution to set it up? How do I use the binder key? The runtime has a script to import, but from  from the desktop. But apparently I have to place the Excel file in the solution folder?.

This is directly from the help:

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You can open a bound runtime file in FileMaker Pro Advanced to make modifications to it. However, if you selected the Remove admin access from files permanently option when you bound the files, then you can’t regain access to some features. See Removing Admin access to databases. In this case, you’ll have to open the original database files in order to make design changes in FileMaker Pro Advanced and then rebind them using the binding key that you assigned to that runtime database solution.