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Originally Posted by Nike-it
So, all versions should be compatible, not sure only about Steam. More exact info will appear in a week.
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The way it's often worked (in my experience) is that Steam only works with Steam. It happened with Dragon Age: Origins - Awakening from BioWare, most/all DLC they offer and so forth.
The reason is, I believe, that Steam-bought/based games install in the Steam directory and I *think* they install slightly differently, but I could be wrong. Either way, trying to buy a programme that requires another over Steam doesn't work because it "blocks" you from purchasing it. An example would be the Modern Warfare 2 map packs - You can't buy them without Modern Warfare 2.