In the KDE enviroment, the default setting in Mageia is the double click contrainly the default single click in KDE.
There is a bug report opened for this here:
https://bugs.mageia.org/show_bug.cgi?id=781
i found also a discussion in the KDE forum here: http://forum.kde.org/viewtopic.php?f=15 ... 6&start=15
I dont want to say anything about this setting for other enviroments because i dont have any experience except KDE.