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A general description is here.
On Windows, the C stack size has been increased to 64MB (it has been 10MB since the days of 32MB RAM systems).
Windows-specific changes will now be announced in this file (‘NEWS’). Older changes remain in the ‘CHANGES’ file.
On Windows there are two new environment variables which control the defaults for command-line options.
If ‘R_WIN_INTERNET2’ is set to a non-empty value, it is as if ‘--internet2’ was used.
If ‘R_MAX_MEM_SIZE’ is set, it gives the default memory limit if ‘--max-mem-size’ is not specified: invalid values being ignored.
A few people have reported problems with junctions, although they were tested on Windows 7, XP and Server 2008 machines. Setting the environment variable ‘R_WIN_NO_JUNCTIONS’ to a non-empty value (e.g. in ‘~/.R/check.Renviron’ will force ‘R CMD check’ to use copies instead.
For ‘tiff(type = "windows")’ in Windows, the numbering of per-page files except the last was off by one.
In Windows, loading package ‘stats’ (which is done for a default session) would switch line endings on ‘stdout’ and ‘stderr’ from CRLF to LF. This affected ‘Rterm’ and ‘R CMD BATCH’.
In Windows, the compatibility function ‘x11()’ had not kept up with changes to ‘windows()’, and issued warnings about bad parameters. (PR#14880)
In Windows, the ‘Sys.glob()’ function didn't handle UNC paths as it was designed to try to do. (PR#14884)