The list that has the "all items" view that I wish to change  was a
custom list imported from a spreadsheet. The list is in the news area.
I already tried to change the allitems.aspx file under \60
\TEMPLATE\1033\SPSNEWS\LISTS\CUSTLIST (because I assume that an
imported spreadsheet is a custom list), but any change I am making,
even something as simple as giving a table a border to see if I'm in
the right file, is not reflected. I can't find the magic file, I
guess.