Frédéric, thanks, for your help, on the window: dxf-dwg Translation Setup, Settings in Selected Translator, Drawing Units, I change the value from 1mm to 1m, then on Set scale Factor: I´ve choosen, use constant factor for all convertions (this case 1:100), then save settings. And that´s it. It opened with scale 1:100, perfect.
thanks also for Link