msjet40.dll Error Fix

What is a DLL?

DLL (Dynamic Link Library) files contain computer code and resources that can be used by multiple programs at the same time. This uses less system memory and helps your computer system run more efficiently. DLL files give program developers the ability to reuse code to add features to several programs without the need to write new code for each program.

There are many programs that require DLL files to function properly so when one of them is damaged or missing it will cause program crashes and poor system performance.

What is msjet40.dll?

Msjet40.dll is the module that the Microsoft Jet Database Engine was built on and is often referred to as JET (Joint Engine Technology). The msjet40.dll is the Jet product version 4.0. This version includes storage support for Unicode characters alongside NT sorting method, compressible data types, enhanced table creation and modification, memory files that can be indexed, and a user list which allows administrators to determine who is connected to the database.

It is in this version that changes to the data types are more like the SQL server such as LongText/Memo, Binary/LongBinary, Dat/Time, Real, and others. It has finer grain when it comes to security, support to referential integrity, and invocation and termination of transactions.  Connected users remain connected with its connection control function but once disconnected they cannot reconnect and new connections cannot be made. This is useful for database administrators to gain control of the database.

The msjet40.dll application evaluates and carries out requests for data as well as handles reading and writing of the data for the Microsoft Access databases. It allows multiple users to access the database at the same time. To prevent that data from being corrupted when multiple users try to write to the database the msjet40.dll process employs a data write locking policy. This locking policy allows any single user to only modify the database records to which they had applied a lock giving them exclusive access to the record until the lock is released.

This record locking feature of the msjet40.dll application is a new function introduced in the JET 4 release. Previous versions used the page locking model in which the Microsoft databases are organized into data “pages” with fixed length of 2kb data structures that divide up the database. The JET 4 release version uses 4kb data structures. Access to the JET databases is done on a user level. The user information is kept in a separate system database and access is controlled on each object in the system.

Recommended fix if you are experiencing msjet40.dll error messages:

DLL files are important parts of your operating system and many programs require them to function. When these files become damaged or are missing it causes poor system performance and system crashes. To fix these problems the user must replace the damaged file with a valid working version. If a working version cannot be found the user may perform a reinstallation of their operating system.

Msjet40.dll is created by:

Microsoft Corporation

Known file path:


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