Thanks __J !
My goal was to move some files into a hidden directory in order to make a program run better. I found an option in Konqueror to show hidden files. With this option enabled I managed to move the files to the hidden directory. So, my goal is accomplished.
I tried your suggestion about the Console. I made a search in Konqueror for Konqueror and found the path to the program. I typed according to your suggestion at the prompt in the Console. A lot of things started to happen in the Console window and at last a welcome window for Mandrake Linux opened up. The interface of this Konqueror window was changed compared to my ordinary kde windows appearance.
Well. I have a lot to learn about Linux, and I'm taking it slowly, just solving one task at the time. And. as I said, my goal about moving the files into the hidden directory is accomplished, so for now I'm satisfied. Next time I have to manage hidden files it's time to learn more about handling hidden files in Linux.
Thank You for your help !