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Microsoft.Win32.RegistryKey rCore = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\R-core");
if (rCore == null)
{
   thrownew System.ApplicationException("Registry key is not found.");
}
bool is64Bit = System.Environment.Is64BitProcess;
Microsoft.Win32.RegistryKey r = rCore.OpenSubKey(is64Bit ? "R64" : "R");
if (r == null)
{
   thrownew System.ApplicationException("Registry key is not found.");
}
System.Version currentVersion = new System.Version((string)r.GetValue("Current Version"));
string installPath = (string)r.GetValue("InstallPath");
string bin = System.IO.Path.Combine(installPath, "bin");
// Up to 2.11.x, DLLs are installed in R_HOME\bin.// From 2.12.0, DLLs are installed in the one level deeper directory.return currentVersion < new System.Version(2, 12) ? bin : System.IO.Path.Combine(bin, is64Bit ? "x64" : "i386");

match Microsoft.Win32.Registry.LocalMachine.OpenSubKey (@"SOFTWARE\R-core") with
| null-> System.ApplicationException("Registry key is not found.") |> raise
| rCore ->let is64bit = System.Environment.Is64BitProcess
   match rCore.OpenSubKey (if is64bit then"R64"else"R") with
   | null-> System.ApplicationException("Registry key is not found.") |> raise
   | r ->let getString key = r.GetValue (key) :?> string
      let (%%) dir name = System.IO.Path.Combine (dir, name) 
      let currentVersion = System.Version (getString "Current Version")
      let binPath = getString "InstallPath" %% "bin"if currentVersion < System.Version (2, 12) then
         binPath
      else
         binPath %% if is64bit then"x64"else"i386"