__int128 - What??

Why does VC++ have an __int128 type but no way to use it? Apparently there are no official references to it at all. If I try to use it, it gives me errors about it not being used in the correct architecture.

What is it for, and is there any way I can use it? I'm just curios. I can easily use a bignum library (and I am).
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Because the IDE can be used with a compiler that can produce code for several architectures, one of which can store 128-bit integers.

My guess is that it's an x86-64 type. Note that if you choose to use it, your code will not run on x86 systems.
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