Not able to get rid of a Question mark in the Dock
A friend got stuck with a Question Mark in the Dock of his 4 year old iMac that was linked to an app not compatible anymore with his latest 10.8.2 version ( guess it was a Power PC app, before Mountain Lion, he was still on Leopard ). He apparently deleted the app and some dependencies manually ( instead of using App Cleaner & Co. ) and now whenever he is hovering over that Question Mark, even before being even able to pull it out from the Dock, the screen flashes up white and the Finder resets.
Is there a way to access the Dock through an element of his user library to get rid of that Mark, or even through a Terminal command ( not that I like to delve in there, but Terminal commands have helped me personally quite often ) ?
Does the Dock have a dedicated place in the Library's User Folder ? Couldn't find anything on my own Mac.
Thanks for any clue ....
MacBook Pro, OS X Mountain Lion (10.8.2), i7 @ 2.7 GHz - 16 GB Ram