A filing cabinet or file in a dream often represents your memories and thoughts.
If you dream that you file something away, it can mean that you are trying to put your thoughts in order after finding yourself in a confusing situation.
You could be trying to reconcile conflicting memories or trying to reconcile conflicting ideas that you have about someone that you know.
Putting something in a file can represent hiding away upsetting thoughts or emotions, while removing something from a file can symbolize facing thoughts that you have been repressing.
Finding yourself locked or shut in a room full of files can mean that you need to deal with thoughts that you have been avoiding.
A dream that you have lost a file can mean that you are lacking important information.
Dreams about computer files have meanings that are similar to the meanings of dreams about paper files.