.JET File Extension
File TypeJET Database File
What is a JET file?
Database file created by the Microsoft Joint Engine Technology (JET) Engine; contains a database structure, which includes tables and fields, and table row database entries in the JET format.
The Microsoft JET Engine is a SQL database engine that was distributed with several different Microsoft applications, including Microsoft Access. However, Microsoft no longer supports JET and has moved to SQL Server. You can still open JET database files by renaming the "jet" file extension to "mdb," which enables the file to be opened by Microsoft Access.