DiskInternals Office Recovery scans entire surface of your hard drive in order to locate all Microsoft Office documents. In order to find the documents it uses a set of signatures characteristic for the Office file types. The file system is also scanned in order to retrieve the names of the files. The results of the disk scan are matched against information contained in the file system, and you are presented with a complete list of all documents that are on the disk and that are still possible to recover.