Other mime types used for MS Write are application/x-wri,
application/mswrite and application/wri. I think these were
pretty rare though.

Change-Id: I2bf48ab7a2fb1d979db38774ae0547c5ab6040d4
Reviewed-on: https://gerrit.libreoffice.org/21552Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>