You mean something like this?
#include <GuiConstants.au3>
#include <GuiConstantsEx.au3>
#include <FileConstants.au3>
#include <EditConstants.au3>
GuiCreate('Drag and Drop', 700, 600, @DesktopWidth / 2 - 192, _
@DesktopHeight / 2 - 235, -1, $WS_EX_ACCEPTFILES)
GUICtrlCreateGroup("Dict Files", 5, 5, 570, 90)
GUICtrlCreateLabel('Select file:', 20, 30)
$dropFile = GUICtrlCreateInput ("", 120, 30, 200, 20, -1, $WS_EX_STATICEDGE)
GUICtrlSetState (-1, $GUI_DROPACCEPTED)
GUICtrlSetTip (-1, 'You can drag & drop files here...')
GUICtrlCreateLabel('Select file:', 20, 60)
$dropFile = GUICtrlCreateInput ("", 120, 60, 200, 20, -1, $WS_EX_STATICEDGE)
GUICtrlSetState (-1, $GUI_DROPACCEPTED)
GUICtrlSetTip (-1, 'You can drag & drop files here...')
GuiSetState() ;Loop GUI
While 1
$msg = GuiGetMsg()
Select
Case $msg = $GUI_EVENT_CLOSE
Exit
EndSelect
WEnd