That may have been true in r51520, but we are at r51566 and that does
work as documented AFAICS.
Note though that this is only a temporary workaround, and it will go
away once repositories are rebuilt for 2.12.0, and simply bulding the
packages from sources would have worked.
On Fri, 2 Apr 2
I realize that R-core must be busy with the imminent release of
2.11.0, so please consider this not urgent.
The NEWS file for 2.12.0 (Windows-specific) says, in part:
For now, 32-bit packages with compiled code built under
2.{10,11}.x can be used, but this will be disabled before
release.