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What is an MDW file?
Microsoft Access is a relational database management system (RDBMS) available for Windows. It allows users to create, manage, and report on databases, as well as connect those databases to other applications.
In Microsoft Access 2003 and earlier versions, users could create database workgroups, which specified one or more users who should be able to access or update a database via user-level credentials. These workgroups (and included users' login credentials) were saved as MDW files.
In Access 2007, Microsoft removed the ability to grant database permissions at the user level. Thus, Access 2007 databases cannot be linked to MDW files.
NOTE: You may see MDW files referred to as WIFs; WIF stands for workgroup information file.
How to open an MDW file
In Microsoft Access 2003 and earlier versions, you can select Tools → Security → Workgroup Administrator to create and update workgroups.
In Microsoft Access 2007 and later versions, you can manage user-level security for an MDB file by selecting Database Tools → Administer → Users and Permissions. For more information, click here.