Outlook blocks attachments with a exclamation mark in the filename after the last Windows Update from 13.06.2017

The last windows/office update round from June 13th modified Outlook in a way that it blocks attachments which has a exclamation mark within its filename.
Just remove the exclamation mark from the filename and everything works again. Tested with Outlook 2007 and Outlook 2010.

Message within Outlook (german Outlook): „Outlook hat den Zugriff auf die folgenden potenziell unsicheren Anlagen blockiert“ or „Outlook has blocked access to the following potentially unsafe attachments“