Just to add to what has already been said... If you have a cold backup and an experienced DBA, you can probably create an init file, control files and open the database without having to provide any archive logs. But it seems as though you are missing control files, online redo files and any archive log files. It this was done as a hot backup, then you have no hope of getting anything out of it. Given that all of the files are a part of default table spaces, unless the users data file is larger than a 10MB, it is unlikely that this is anything other than an empty Oracle database. In which case you can just use dbca to create a new blank database.