I created a DVD-ROM in DVD Studio Pro 4 with the purpose of having a working DVD and also have additional files in that same disk. It all works fine in a Mac; I can watch the DVD, and I can also access the additional files (one .pdf and one .mp4) from the Finder. The DVD also works fine in any DVD player.
However, when I put the disk on a Windows computer, I can only watch the DVD movie, but the additional files DO NOT appear in Windows Explorer. If I open the dvd drive on a Windows computer, there's only the AUDIO_TS and VIDEO_TS folders, and nothing else.

Does anybody have an idea of what's going on here? PLEASE HELP.
Thank you.