Using Unicode with Recorder.AddSyntaxToScript

I have written my own record action (as script extension) to handle certain cases during test recording. The implementation of the record action uses `Recorder.AddSyntaxToScript` to add operations to the test being recorded. Unfortunately I noticed that this function is unable to handle Unicode correctly.

Example (very much simplified): 

function RecordExecute_CurrentControl_JS()
{
  var call;
  call = Syntax.CreateInvoke();
  call.ClassValue = 'BuiltIn';
  call.InvokeName = 'MessageDlg';
  call.IsProperty = false;
  call.AddParameter('‰Šš›‹žŽŸŒœ•€'); 

  Recorder.AddSyntaxToScript(call);      
}

This will end up in my keyword test as follows:

BuildIn    | MessageDlg    | "\\u2030Šš\\u203a\\u2039žŽŸŒœ\\u2022€" 

Is there any method I need to call on my string parameter to prepare it for `AddSyntaxToScript`?

P.S.: Recorder.AddTextToScript works just fine with any Unicode-String passed.