Page not found (error 404)

The page http://ftp.iltecnicofacile.altervista.org/A1.1%20Conversioni%20potenza%20energia%20lavoro%20calore/A1.1%20Conversioni%20potenza%20energia%20lavoro%20calore.htm was not found on this server.

This can be due to:

Pay attetion to UPPER and LOWER cases
http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html