File Type ASP.NET Master Page IconASP.NET Master Page
File Format Proprietary (Microsoft)
Usage Runs when opened
Popularity ★ ★ ☆ ☆ ☆  Uncommon

Master pages are used by ASP.NET and have have a predefined layout that can be applied to multiple pages. They may include HTML elements, static text, and server controls. When a master page is modified, all associated pages are modified as well.

A master page is identified by a "@ Master" directive that is used in place of the "@ Page" directive found at the beginning of standard .ASPX pages.

Open With

IconMicrosoft Visual Studio

Updated May 8, 2009
Information from the PC File Extensions Reference