1. you can delete that one
2. Keep that one but, it could be deleted without too much of a problem. It is just a collection of previous visited stuff.
3. Would need to know where that one is before passing judgement.
Programs like this, while performing as advertised, do not help the user through the process. It is possible with this sort of program to do exactly what you are concerned about. Trash the machine.
Hidden files are hidden for a reason. Most of them, and there are thousands, are essential to the smooth running of your Mac.
Hope this helps
Hello - I'm using an iBook G3, 800mhz, 640ram, 30 gighd, Panther 10.3.9, with FF 2.0.01 as the browser. I downloaded WhatSize, free shareware recently, to identify and delete hidden and perhaps useless files/folders in the hard drive. Works well, and very useful. But it seems that without good information an amateur could quickly get into some real trouble happily deleting, gaining great extra hard drive space, and rendering the computer crippled. Three examples on my computer:  X11R6; left over from OpenOffice after my change to NeoOffice; measures 88.1MB  Library/Caches; measures 63.6MB  USR/Share 'emacs'; measures 49.3MB. I'd like to delete these, but in the absence of good info I'm leery. Does anyone have a recommendation? Thanks much.