To see a filing cabinet in your dream suggests that you need to keep your facts and information straight.
The filing cabinet may also represent the memories or trivia you keep stored in your mind and need to retrieve from time to time.
If you dream that the drawers of the file cabinet are wide open, this symbolizes your openness toward other viewpoints and opinions. However, if the file cabinet is locked, there is something that you do not want revealed to others.
It could also mean that you are being close-minded.