The ics file type. Apple isn’t the only one that builds applications that use it any longer and there have been a couple of instances where users install a 3rd party app only to find that their default calendar is no longer iCal. How to fix? Not a hard one. Simply locate a .ics file (there are typically plenty of these in ~/Library/Mail Downloads) and then do a Get Info on the .ics file (Get Info = command-i while clicked on the file). Once you have the Get Info box for the file up, click on the Open With field and select iCal. Then click on Change All. That should…