.DB3 File Extension
SQLite Database File
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What is a DB3 file?
Database file created by SQLite, a lightweight, self-contained database program that creates databases using plain files; contains the database structure as well as data records; used for storing and retrieving structured data using SQL.
A common SQLite DB3 file is PalmDatabase.db3, which stores personal information on the Palm Pre, including contacts, account information, and call logs.