Thanks, that helped me.
That system folder was missing from the project I downloaded from the net, thats why I wasnt able to load it.
I found out why it didnt work with zip before.
Im using winrar, and it seems that earlier versions than 3.0 doesnt include hidden filer/folders when packing with zip, but when packing with rar it includes them, thus I wasnt able to load scenes that i packed with zip.
Winrar 3 seems to pack the hidden files no matter what compression type you are using, so everything works as it should
Thanks a lot