Merge pull request #241 from nushell/windows_quotes

Fix quoting on external Windows commands

src/commands/classified.rs

@@ -239,10 +239,17 @@ impl ExternalCommand {
                 }
             } else {
                 for arg in &self.args {
+                    let arg_chars: Vec<_> = arg.chars().collect();
+                    if arg_chars.len() > 1 && arg_chars[0] == '"' && arg_chars[arg_chars.len() - 1] == '"' {
+                        // quoted string
+                        let new_arg: String = arg_chars[1..arg_chars.len() - 1].iter().collect();
+                        process = process.arg(new_arg);
+                    } else {
                         process = process.arg(arg.item.clone());
                     }
                 }
             }
+        }
         #[cfg(not(windows))]
         {
             let mut new_arg_string = self.name.to_string();