A file with the .accdb file extension is an Access 2007/2010 database file. It is the default format for database files used in the current version of MS Access.
How to open a database file (Ms Access) with Excel
This format replaces the older MDB format used in earlier versions of Access (before version 2007). This format includes improvements such as support for encryption and file attachments.
When you work on an .accdb file in Access, a similar MS Access Record-Locking Information file (with the extension .LACCDB) is automatically created in the same folder to prevent you from accidentally editing the original file. This temporary file is especially useful when several people use the same .accdb file at the same time.
ACCDB files can be opened with Microsoft Access (version 2007 and later). Microsoft Excel imports ACCDB files, but the data must be saved in a different spreadsheet format.
