How the text will be output depends on the RightToLeft property. If it is set to false, then a text (all symbols except letters) is output from left to right. The picture below shows a text sample in Arabic that is output from left to right:

 

 

If the RightToLeft property is set to true, then a text is output from right to left. The picture below shows a text sample in Arabic that is output from right to left:

 

 

In any case a text written in a right-to-left language will be output right to left.