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A general description is here.
The file selection items on Rgui's File menu now work in Unicode and so allow filenames not in the current encoding to be selected.
file.choose() and choose.files() now work with Unicode file names, so are able to select filenames not in the current encoding. (Note that we do not expect to handle directory paths not in the current encoding and they will not be retained as the current search directory.)
The script editor is now able to open files with names which are not in the current encoding: however the title displayed will replace invalid bytes by '?'.
file() and pipe() now open non-ASCII pathnames as Unicode: this helps if R is running in a character set different from that used by Windows.
The attenpt to make the 'Load' button in the GUI preferences start in the home directory failed if the latter was specified with forwward slashes, and reset the current search directory for other file open dialogs (e.g. for opening a script).