Some MacOSX applications like iTunes don’t really have problems when I move a file around – they still find the moved file easily (and I’m pretty sure they have not have opened the file before).
How are they doing it? One possibility I could think of is the FS event notification system. (related question)
But I remember that I have seen some absolute file handle / id or so and I thought that maybe they can always query the current file name by that file handle. Is there something like that? Maybe the inode nr but that is a bit too less because I’m not sure how to get the filename from an inode nr and how to open the file.
As Albert mentioned Alias Manager has been depreciated, the replacement is the URL Bookmark methods