This is the database file of the server, which is used to record the user's ID and password, registration information, etc. As for the location, I remember that mine used to be in (the drive letter of the server) X:\mirserver\mud2\DBSrv200\FDB The server is different

Depending on the version, mir.db may not always be in this location. Look carefully. If it is not available, ask for it from upstairs.