creo4 config.pro option documentation for: OPEN_DRAW_SIMP_REP_BY_DEFAULT 
open_draw_simp_rep_by_default
Set to yes
to always open the Open Rep
dialog box when opening a drawing.
Default and Available Settings:
no* - Opens a drawing directly when you click File
> Open
, without opening the Open Rep
dialog box.
yes - Opens the Open Rep
dialog box when you try to retrieve a drawing using File
> Open
.