To see a file cabinet in your dream suggests that you need to keep your facts and information straight. The file cabinet may also represent the memories or unnecessary details you keep stored in your mind and need to retrieve from time to time.
To dream that the drawers of the file cabinet are wide open denote your openness toward other viewpoints, opinions suggestions, and criticism.
To dream that the file cabinet is locked indicates that there is something that you do not want revealed to others. Alternatively, it may indicate that you are being close-minded.