Why a project from another computer or person opens paused, what is paused, how to trust it, and how administrators pre-trust folders or switch the prompt off. A project file is not only data. It can carry schedules flagged to run at startup, catch-ups for slots missed while it was closed, bound queries that re-run on open, pipelines, imports, exports and e-mails — and the local database those run on can read and write any file you can. So a project that came from another computer or person must not be able to do any of that just by being opened. A project opened from a location you have never saved to or trusted on this machine — an .atx double-clicked from an e-mail, a copy on a share, a cloud copy, a browsed file — opens normally, with a strip under the ribbon: "This project came from another computer or person.
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