If you’ve stumbled upon this post, you most likely experienced one of the nasty new MS Outlook security features shipped with the june 2017 security update, which blocks file attachments containing two or more consecutive periods or an exclamation mark in their name or extension. Here’s the offending message:
Outlook blocked access to the following potentially unsafe attachments: filename.ext
As we already said, the culprit in this case is to be found in the latest MS security patches released after the ever-growing malware threat, which greatly excalated within the past few months. We’re basically talking about a regression bug here, which is rather common in these kind of scenarios: the urge of preventing the user from compromising the system with potentially bad behaviours ends up with blocking a number of other legitimate and perfectly safe activities, such as opening most of these files.
Luckily enough, Microsoft acknowledged the issue and has already released a number of patches to overcome the issue. Too bad that they left out some Outlook builds – such as Outlook 2007, which is still vastly used worldwide – but at least it’s a start.
Here are the patches currently available at the date/time of writing: