.SQLITEDB File Extension
What is an SQLITEDB file?
Database file stored using SQLite, a database engine often used to create embedded SQL-based databases; stores data using records, which contain data types and values; most commonly used for storing contact information on iPhone devices.
The data within the iPhone contacts file AddressBook.sqlitedb can be viewed using SQLite Database Browser, an open-source program.
NOTE: SQLite database files also use the extension .SQLITE.