Version 4.0, introduced in 1997, added a plug-in architecture much like that of Adobe Photoshop, which enabled third-party developers to add features to FileMaker. A bundled plug-in, the Web Companion, allowed the database to act as a web server. Other plug-ins added features to the interface and enabled FileMaker to serve as an FTP client, perform external file operations, and send messages to remote FileMaker files over the Internet or an intranet.