And another step closer to opening my test file correctly in Excel.

Change-Id: Ib6aa8ddb2f2792513c7263d86865e08fe5f1483d
(cherry picked from commit 81b9d431)
Reviewed-on: https://gerrit.libreoffice.org/3686Reviewed-by: Kohei Yoshida <kohei.yoshida@suse.de>
Tested-by: Kohei Yoshida <kohei.yoshida@suse.de>