Try right-click (cmd+click) on the file >> Cancel.
Hi dude! Thanks a lot! I had not thought of the combination with the right click. Had tried it alone. It did not work with the Command+right click, however, but with the Option+right click. But, as I have changed the position of the Option and the Control tabs (in order to be easier to type Portuguese characters) I do not know if what worked is the Option+right click, or the Control+right click, because I don't know if the change affects this kind of operation too. Anyway, THANKS a lot. You hinted at the right solution! ;-)