Apple made a controversial change in Snow Leopard. It’s a fairly system-level one, though, so perhaps the majority of users will not have had any issues with it – but it’s made some experienced Mac users pretty unhappy. What’s changed is the way in which files open when double-clicked.
It used to be that OS X embedded what’s known as a Creator Code in new files, so that the system knew to open files within the applications that made them. Rob Griffiths published a discussion of this behaviour, and the changes in Snow Leopard, in Macworld back in September last year. Have a read of that piece, and the lengthy comments that accompany it, if you want to understand the issue better.
I haven’t been impacted by this change to a great degree, but one of the applications that comes up in discussion of ways of fixing the change, and giving back more control over what applications open files, caught my eye. Michel Fortin’s Magic Launch is a Preference Pane that lets you manipulate file-opening in ways that allow you a great deal of flexibility.
It solves the problem of Creator Codes being removed, but it also adds some excellent functionality, and that means it’s well worth a look even if you’re untroubled by the main issue it addresses.