Yes you can. Once you've done that open the frontend, and delete the links.
Re-create them using File, Get External Data, Link and when you locate the
backend, it'll prompt you for the password (which will get stored with the
links).
However, you should know that the database password is easily cracked.
You could set an autoexec macro in the backend that pops up a message saying
"Access the data via the frontend", and follow that with the Quit Action.
You can then disable the shiftkey bypass on the backend.

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Joan Wild
Microsoft Access MVP