The Microsoft Jet ISAM driver is responsible for storing data in the database file. It is also responsible for providing query and access control (security) services. The following table describes components that provide these ISAM services.
| Component | Description |
| MSJet35.dll | Contains the main engine functionality, including the Microsoft Jet engine that is responsible for data storage, the query engine, and security routines. It handles all data storage and retrieval from the native ISAM driver and all querying against native and non-native data. |
| MSJInt35.dll | Contains all localized Microsoft Jet strings. Because Microsoft Jet is translated, or localized, for many different countries, its language-specific strings are kept in a separate library. |
| MSJTer35.dll | Contains Microsoft Jet error services. Moving strings and error messages to a separate DLL allows easier maintenance of the various components. |