Would an interactive CD-ROM require a preloader?

programming flash
1

Hi, the last time I made a preloader was for Flash 5 by doing something like actionscript on the 3rd frame saying “if loaded, play, else, gotoframe(1)”.

How necessary is a preloader if I want to make a reasonably simple interactive CD-ROM in Flash CS3?

Also, what’s the basic, standard methodology for creating preloaders in CS3?

Thanks very much
Pete