.accdb file is a Microsoft Access 2007, 2010 database.
Currently only Access 2007 and Access 2010 use this file type. Previous MS Access
versions use .mdb file type.
To break password protected Access database (.accdb file) you can use
Access
Password program. Access
Password recovers all Access password types and supports all
Access versions.
Possible password types:
Password to open
Access database may contain a VBA project inside. To
recover password-protected VBA project you should use
VBA Password program.