Hi,

Just guessing: plus sign or not may have to do with which files your app 
accepts in the dragEnterEvent i.e. CopyAction (plus-sign) or MoveAction (no 
plus-sign).

void Class::dragEnterEvent(QDragEnterEvent *event)
 {
        if (event->mimeData()->hasUrls() && (event->proposedAction() & 
Qt::CopyAction))
                event->acceptProposedAction();
        else
                event->ignore();
}

and/or dragMoveEvent and/or dropEvent.

Best, Michael.

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