Calendars display, but no .ics files on my hard drive!

ICal started behaving weirdly after I upgraded to Tiger. Calendar groups I created would disappear every time I quit and restarted iCal, and new 'Home' and 'Work' calendars would appear at the same time.
I deleted preference files. I even re-installed iCal. Then I started searching, and discovered that my ~Library/Calendars folder was empty! Then I discovered that no .ics files exist anywhere on my hard drive.
And yet, the calendars keep appearing in iCal, and I am able to add events, etc.
Anyone got a clue what the **** is happening here?

Before Tiger, the iCal files were stored in ~Library/Calendar/ and in the format CalendarName.ics. As of Tiger, they've been moved to ~Library/Application Support/iCal/Sources/. Each item in the source folder is a folder that ends in .calendar. The .calendar files are named in some opaque method that leaves a long string of incomprehensible chararacters that looks a lot like how Address Book photos are named. Within these .calendar folders, you'll find a file called corestorage.ics, which is where your calendar data is being stored.
However, I don't think that information will fix your problem. You might want to try exporing, deleting, and importing your calendars.

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