creo3 config.pro option documentation for: UPDATE_OLD_APPEARANCE 
update_old_appearance
always
*
, never
, prompt
Updates the ambient value of the appearances that were created in releases prior to Creo 3.0 when the ambient value is less than 55.
Always - Automatically updates the ambient value.
Never - Does not update the ambient value.
Prompt - Displays a warning message that allows you to update the ambient value of the appearances.