i am using SUSE 11.0 KDE 4.0 , for my system the default archiving software is " ARK version 2.9.999 release 15.1 "

i came to notice that .. whenever i try to open a zip file protected by passwords, it is not asking passwords, and showing the files present in the zip file. If I tried to extract those files , even now also it is not asking passwords but it is creating a 0 byte files in extraction process. So i was not able to open password protected zip files using "ARK".

I am also using UNRAR s/w which is opening .rar files only .

Try using "unzip" instead....