Originally Posted by Tacty
yes, but none of them media players and such could be set as default program for respective media formats...
Actually, other applications can be set as the default. Command-I gives you the option to choose which program will be used to open a given file type from that point on. No one need use any Apple application as the default unless a particular file type can't be recognized in any other way (in which case perhaps it's better to use a non-proprietary filetype, hence the absence of iBooks in my library).