The Nikon D800 requires Camera Raw 7.1
That version of ACR is compatible with CS6 - in fact you can download the later Camera Raw 9.1.1 if you have previously purchased CS6 - there is no need to buy additional software
You can download 9.1.1. here
Thank you very much Dave for your help
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I remember this because I got my D800 at that time.
The shipping version, ACR 7.0, did not have D800 support. That was added in a subsequent 7.1 update, as Dave says.
However, Adobe also released an ACR 6.7 update for CS5 at the same time, after CS6 was released - and this update also had D800 support. This was the Photoshop version I had at this time, so that's why I remember it. It was an update sequence not seen before or after from Adobe.
As I remember it, the D800 release was such a big event that the common perception was that they just had to do it this way.