outlook 2007 block xlsx as unsafe attachment

Reference:
Unblock Attachments
Attachments are blocked after applying June 2017 update
Description of the security update for Outlook 2007: June 13, 2017

2017/6/13 的 Office Security Update 造成 Outlook 收到 .xlsx，會顯示 blocked access to the following potentially unsafe attachments。

暫時解法：
執行 regedit 新增 HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security\AllowUnregisteredMapiServices，格式為 DWARD，值為 1。

只能等 Microsoft 的修正檔了。