If you dream of an abrasive file, such as a nail file, it can be a sign that you are being too abrasive, or you could feel that someone is behaving abrasively toward you.
Think about whether you should be approaching a situation in a more delicate manner.
A dream that you file something down can be a message that you can achieve a goal by working at a slow and steady pace.
Watching someone file something down in a dream can mean that a situation in real life is wearing you down.
If someone hands you a file in a dream, it can mean that you need to simplify your life and avoid wasteful, unproductive activities.
A dream that you are in prison and someone smuggles you a file can mean that there is a way for you to escape from a situation that appears to be hopeless.