I first had the OEM version of Prophecy on a Real 3D Starfighter demo CD. I loved it and I wanted to get the full version. I ended up getting Age of Empires instead. I then discovered that my real goal was Wing Commander: Prophecy after playing Age of Empires. Too bad it wasn't available at the time. My dad then purchased it from Ebay for me earlier this summer and now I have it. It's too bad the person didn't send it with any manuals.
Neat, But do you mean the Prophecy Demo? An OEM is a disk-only version of a full game, so if you had an OEM version you wouldn't need the game.
No. The OEM version of prophecy wasn't the full game and it only contained the content that was on CD 1 of Wing Commander Prophecy. You would play the same missions that you would in the full game, but instead of inserting CD 2 going to the H'rekkah system, the game would pop up with the advertisement you would see at the end of the Prophecy demo.
It wasn't the demo either.
You say it was on a CD with other demos? Did they make any other changes for size considerations? Were all the movies still there too? Probably some of the others here have run into it before though.