Arabic date format and Microsoft programs

I return to
http://www.unicode.org/mail-arch/unicode-ml/y2011-m10/att-0059/1999-12-31.html

Microsoft programs (Internet Explorer, MS Word), display this as
   31/12/1999

Other programs (Firefox, Opera, OpenOffice) display this as
   1999/12/31

NB:
I do not ask how to write unambiguously. (This can be done with
<bdo dir=ltr>.) It bothers me that different programs display
this file differently.
Received on Sat Oct 15 2011 - 10:24:44 CDT