When creating a new ASP.NET 2.0 website in Visual Studio 2005 you may notice the App_Data and/or the App_Browsers directories.
App_Data is a directory reserved for databases and database related files, such as .mdb (Microsoft Access Database), .mdf (Microsoft SQL Express) or XML files. The main advantage of using this folder over any other folder is the preconfigured access permissions, which protect your database from being
App_Browsers is a directory which stores browser definition files. These definition files allow you to identify certain browsers.
You can add any of these special folders and more by right clicking the project in Visual Studio 2005 and choosing Add Folder.