I go to xcode>preferences>file_types, change association for file type "xyz", click apply+ok, reopen xcode>preferences>file_types, check association for file type "xyz", its set as I just edited it.
Not I quit xcode, start it again, xcode>preferences>file_types, check association for file type "xyz", and its getting reset to its old value just like i never edited it.
This is so lame, kindly suggest something :(