What is .DB3 file extension?
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.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.