A flat file database is a database stored as an ordinary unstructured file. Flat files are used not only as data storage tools in database and content. Working with Flat File Transactional Data. Use the Flat File Sample Wizard to inspect and document metadata for flat files. Using the Import Metadata Wizard. Oil Patch Supply Company more. Select the.zip file for the desired database to download and extract the data. See the corresponding.txt file for a description of the file layout.