It means When u are trying to open a file with errors or a file that ur phone doesnt support.
Example-: amr, wave , mp3 , mmf ,mid ,mpg ,exe ,txt ,mp4 ,xhtml ,html ,stml ,3gp ,mpeg ,css ,dat ,mbm ,zip ,rar ,cue ,bin , sis , ini ,lnk ,com ,net ,aligator ,pdf ,ota ,cgi ,asp
