It should be. If you downloaded the rof2 client off steam, then tried to login on an alt that didn't have the expacs, you could still get in using the client, but couldnt make use of anything exclusively rof2. I know something's flat out changed in the game, like the commonlands zones, but I wasn't around then to know if someone without the expacs they changed on could play from a client that was, though I'm sure once they removed the files it's a whole new ball game.
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