I just recently recieved my new 12 inch pb, and its a great machine. However, I have no use for Quickbooks NUE, so, i dragged its contents to the trash, and emptied the trash. I used Spotlight to see if it can pick up anything I might have left behind, and it found a couple of files like "quickbooks.plist", but there were more letters and numbers in the file name. What is the "plist" extension, and is it safe to remove?