Unable to extract .zip file of Win8 theme

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http://superuser.com – I downloaded some themes for Windows 8. But when I try to open it, I failed to open the .zip file. Even I was unable to extract the contents. While tried to extract, it was showing error like : The zip file is empty Why this is happening ? Actually the theme is from an authorised site and it must have some contents. I'm on Dell Inspiron, running Win8. EDIT: I downloaded it on Chrome, it shown as Completed... (HowTos)