http://bugs.winehq.org/show_bug.cgi?id=31398
--- Comment #2 from Reinhard Berger geist1@sms.at 2012-08-05 03:04:25 CDT --- Update : Since KDE SC 4.9 it is needed to activate the switch "Allow Window Manager to control the window".
When this option is turned off no more drag&drop from KDE's Filemanagers (Dolphin) is possible.
Switch has no effect on GTK2 / GTK3? programs.
Either this is a new KDE or a Wine Bug.
Older KDE Versions before 4.9 (4.8,x) works correctly with drag&drop even if this switch is turned off.