title: issue when calling executable in a path that has space
body: <p>I just installed R on a new Microsoft Windows 7 computer and I am running in the following error when using command line:</p>
  
  <pre><code>"C:\Program Files\R\R-3.3.2\bin\Rscript.exe" --version  
  'C:\Program' is not recognized as an internal or external command,
  </code></pre>
  
  <p>operable program or batch file.</p>
  
  <p>Note that I have added above the quotes around the path with a space. And that I have added in the system path: </p>
  
  <p><code>;C:\Program Files\R\R-3.3.2\bin\</code></p>
  
  <p>Interestingly:</p>
  
  <ol>
  <li>if I just call this <code>Rscript.exe --version</code> it gives the same error, which is very weird: if it finds it, why can't it run it!?! <em>The only explanation I can find is that the error occurs when looking for a dependency of Rscript.exe</em></li>
  <li>I also noticed that this works <code>"C:\Program Files\R\R-3.3.3\bin\x64\Rscript.exe" --version</code> (both folders <code>...\bin</code> and <code>...\bin\x64</code> have an executable Rscript.exe)</li>
  </ol>
  
  <p>Finally I confirm it is an R specific question as all other executables I tried in a subfolder of Program Files can be called through the same command line interface!</p>