Myfolio joomla 2.5 - during unpacking 7zip replace files

Hi,

I have a question about myfolio quickstart. During unpacking files my 7zip (and some others) wants to replace some files with the same name. Why this happened? maybe this package is corrupte?

regards

I get similar issue when I'm unzipping package from joomla.org so don't worry that's fine - probably it is related with zip software.