if it's an accde or mde file, likely they will be of no use.
EDIT
BE VERY CAREFUL IF REMOVING DATA. IF YOU COPY BOTH FILES AND START DELETING STUFF, YOU WILL PROBABLY DELETE FROM YOUR PRODUCTION DATA.
You would copy both, rename back end copy (where the tables are) and re-connect copy FE to the new BE copy. Then look at all connections and ensure they're all pointing to the new BE copy.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.