The default setting for opening files in the KDE file manager and some other desktop aplication
is single mouse click. To get the more familiar Windows like behavior, choose Peripherals in the
main Control Center menu, then Mouse. Activate Double-click to open files and
folders, (select icons on first click) button. Then click the Apply button. This setting will not
influence to Arahne's programs, since they use double mouse click to open files.