Do other people still need to use the files? If so you don't want to delete
them, you just don't want to see them in your file list any more. In which
case you go to Tools > Options > General and change your last used file list
to 0, then click OK. Go back into the dialog and put it back to 4. This
resets all the info on your last used file list.
If you DO want to delete them just browse to the folder where the files
live, right click on the file and choose delete, or highlight the file and
click on the big X on the folder toolbar.
Genine