Stores the user interface configuration for a program; saved in an XML format and contains definitions of QT widgets with slots and signals; can be viewed in a basic text editor or opened with a UI designer program.
Program(s) that open ui files
Mac: Trolltech Qt Designer; Any text editor Windows: Trolltech Qt Designer; Any text editor
Unix: Trolltech Qt Designer; KDevelop; Any text editor
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/ui