adding new extension

["Madhan Ponnusamy" <madhan ponnusamy gmail com>]

Hi,
i had added a new extension to mime named .edu by creating xml file and placed it in <mime>/packages..update-mime-database command added a the extension by creating files named edu.xml in application folder and added a line in globs...
my doubt is i had created a application to open .edu file, how to make that  application the default application for .edu extension. i.e) if i double click the .edu files it should open in the application which i created