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A general description is here.
‘system()’ and ‘system2()’ no longer discard output from the command to stdout and stderr as often as they used to.
It is now built using ‘WiX 3.0’ rather than ‘WiX 2.0’. (As a result it is about 25% smaller.)
There is a combined installer (called ‘R-<version>-win.exe’). When used under 32-bit Windows this works as before and installs 32-bit R. When used under 64-bit Windows there are options to install either or both of 32- and 64-bit R: the default is to install both.
The default package type is ‘"win.binary"’ on both 32- and 64-bit builds: a single repository contains binary packages for both architectures. This is in place for CRAN, CRAN extras and BioC: ‘type = "win64.binary"’ can still be used for any repositories which follow the R 2.11.x convention. With the default filters (see ‘?available.packages’) packages will only be offered if they are available for the current architecture.
The default personal library, e.g. ‘~/R/win-library/2.12’ is now the same for both 32- and 64-bit R.