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Under System Preferences / Users & Groups / Login Items I can see all of the items that I've selected to launch at startup, but the folder, Library/StartUpItems is empty.
Where can I see these items?
The file the preference pane loads the list of items from is:
It is a binary file. You can use Xcode to open it.
For example, if you add iPhoto to your login items:
your com.apple.loginitems.plist will look similar to this: