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At least according to Microsoft, ASMO 708 is not quite the same as ISO 8859/6, but a mostly compatible encoding including, in particular, box-drawing characters and the essential set of accented lowercase letters needed for French. Microsoft reference: <http://msdn.microsoft.com/en-us/library/cc195061.aspx> Unofficial table with Unicode mappings: <http://coq.no/character-tables/dos-708.pdf> <http://coq.no/character-tables/dos-708.js>
Given that everyone else treats this as a label for iso-8859-6, I'm inclined to WONTFIX.
Is this label actually in use at all?