The Mobile Browser Definition File contains definitions for individual mobile devices and browsers. At run time, ASP.NET uses the information in the request header to determine what type of device/browser has made the request.
This project provides a data file that when used with ASP.NET will detect the incoming mobile device and present you as the web developer with a set of 67 capabilities or properties describing the requesting device. These capabilities range from screen size to cookie support and provide all the information you need to adaptively render content for mobile phones and devices.
The Mobile Device Browser Definition File contains capability definitions for individual mobile devices and browsers. At run time, ASP.NET uses this .browser file, along with the information in the HTTP request header, to determine what type of device/browser has made the request and what the capabilities of that device are. This information is exposed to the developer through the Request.Browser property and allows them to tailor the presentation of their web page to suit the capabilities of the target device.
The format of the .browser file is XML and the schema is defined here: Browser Definition File Schema. The Browser Definition File was introduced in the .NET Framework version 2.0. In earlier versions of the .NET Framework, the browserCaps element was used to define browser definitions in configuration files.