Comment 2 for bug 1172844

The desktop-file-utils will set the ubuntusdk.desktop to be the default handler for the text/x-c++hdr, text/x-c++src and text/x-xsrc, types in the /usr/share/applications/defaults.list

Additionally the ubuntusdk.desktop file's exec line is extended with the -client parameter to open the edited files in anexisting instance of the QtCreator.