Unblock “Outlook blocked access to the following potentially unsafe attachments”

April 2, 2010 | Filed under Email, Microsoft Office


Microsoft Outlook is one of the most powerful email client that has a lot of features that a normal user would probably never use. Because email is most used by people in the world, it is also one of the method how virus spreads. Microsoft has always been accused of creating software that is not secured so they have implemented a default security where it blocks all dangerous attachments. When you received an email with a dangerous attachment, you will see a message that says “Outlook blocked access to the following potentially unsafe attachments: file.exe.”

Unfortunately Microsoft Office development team did not made it easy to unblock the blocked attachment from Outlook itself and you will have to navigate to the registry and add the extensions that you do not want Outlook to block at Level1Remove. The easier way to avoid messing with the Windows registry and yet able to unblock the blocked attachments in Outlook is by using Outlook Attachment Enabler.

Outlook Attachment Enabler controls the file types of attachments that Outlook has determined to be unsafe for opening. After installation, just run OAE, go to the Display Blocked Extensions and select the extensions you want to unblock from the list and click the Mark as safe. The changes takes effect immediately. If you cannot find the extension, you can add the extension in the box and click the Add button. We have tested it in Microsoft Outlook 2010 and it works like charm.

Outlook blocked access to the following potentially unsafe attachments

Download Outlook Attachment Enabler

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