Only certain 'raw' file types are allowed to be uploaded here: a .csv file needs re-sufixing or zipping... I tested the file and it worked fine for me - imported cloud and made a surface [v7 + PC] - so... do you have the latest version and its pdf help file ? http://www.crai.archi.fr/RubylibraryDepot/Ruby/em_fil_page.htm get the Cloud_v6,zip file...