Microsoft Access saves information under the following file formats:
| File Format | Extension |
| Access Project (2007, 2010) | .adp |
| Access Blank Project Template (2007, 2010) | .adn |
| Access Database (2007, 2010, 2013, 2016) | .accdb |
| Access Record-Locking Information (2007, 2010, 2013, 2016) | laccdb |
| Access Web App Reference | .accdw |
| Access Signed Packages | .accdc |
| Access Database, used for Add-ins | .accda |
| Access Database Runtime (2007, 2010, 2013, 2016) | .accdr |
| Access Database Template (2007, 2010, 2013, 2016) | .accdt |
| Access Database (2003 and earlier) | .mdb |
| Access Database, used for addins (2,95,97), previously used for workgroups (2). | .mda |
| Access Workgroup, database for user-level security. | .mdw |
| Access (SQL Server) detached database (2000) | .mdf |
| Protected Access Database, with compiled VBA (2003 and earlier) | .mde |
| Protected Access Database, with compiled VBA (2007, 2010, 2013, 2016) | .accde |
| Windows Shortcut: Access Macro | .mam |
| Windows Shortcut: Access Module (class or module) | .mad |
| Windows Shortcut: Access Query | .maq |
| Windows Shortcut: Access Report | .mar |
| Windows Shortcut: Access Table | .mat |
| Windows Shortcut: Access Form | .maf |