Added implementation for embedded Word 97-2003 document.

Change-Id: I47ec39f25beee9a37f2a1e914384bc458df31b78
Reviewed-on: https://gerrit.libreoffice.org/10078Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>