I was going to reply last night but my post had to be approved first....seems to never fail for me. I can't figure something out, i search a little, can't find anything, i go to/join a forum, ask a question to get some help, search a little more while waiting for replies and find the answer minutes after making a thread. So weird!
Any who, after some more research I found that this disk was from the DC magazine...the one that had those Generator demo discs. So it did NOT come with the DC itself, but from a magazine to pop into your PC. Here's what the guy on Reddit said:
"It is the AT&T WorldNet service disc to set up thier service. It came in a Dreamcast Magazine issue with a demo disc and the web browser v2. Here is a picture of it, it's on the bottom right: "