[aJuanJo]

Thanks BetterRed. I've just begun all again from scratch.

Kevin and DiapDealer
After cleansing everything, I installed the official 0.8.5 in my desktop, but again it won't run OK. So I installed the unofficial versión and after deleting, renaming, cleansing source from epub, saving and deleting, inserting files, changing places of html files I haven't been able to reproduce the problem of deleting and crashing... I've used four different epub-copies to make a mess of them and nothing happens... Later I will try in my notebook..

edit
I have deleted files inside both with delete button and with mouse right-click and delete.