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...e UTF16 "widechar" methods): 1) the Win32 interface, using GetEnvironmentVariableW, SetEnvironmentVariableW https://msdn.microsoft.com/en-us/library/windows/desktop/ms683188%28v=vs.85%29.aspx 2) the POSIX-style interface, using _wgetenv, _wputenv https://msdn.microsoft.com/en-us/library/tehxacec.aspx The problem arises due to the fact that these don't quite do the same thing: the POSIX-style interface, used by R, operates at the runtime level (msvcrt), which makes its own copy of the environmental variables. Now, this is not a problem when R is running by itself, as it uses the inter...